Doesn't Spotlight make Quicksilver unnecessary?
No. Spotlight find things, but all it lets you do is open them. Quicksilver finds things and then lets you do all sorts of stuff with them, with just a keystroke or two. Find out more here
 Why don't I see feature 'x' in Quicksilver?
Make sure you have the appropriate plug-in(s) installed. If it's something in the first pane you don't see, make sure it's enabled in the catalog and scanned (so that the catalog source has a number next to the checkbox).
 Why isn't action 'x' available in Quicksilver's second pane?
If an action appears to be unavailable in Quicksilver's second pane (the actions pane), ensure you have the action enabled in the Actions section of Quicksilver's main preferences. If the action you're looking for is obtained from a certain plugin, ensure you install the plugin before checking the 'Actions' preferences.
 Why doesn't Quicksilver find the files I want?
Quicksilver will index files (and other useful items) from anywhere on your computer that you tell it to. To add more files to the catalog of items that Quicksilver keeps track of, you can either customize the existing catalog entries so that they include more files, or you can add new folders to the catalog to include the files in them (and in their subfolders, if you like).
See the Catalog article.
 I customized my catalog, and now Quicksilver has slowed to a crawl! What happened?
You probably set one of your custom entries to have an infinite depth on a folder that contained a vast number of files. See Why is Quicksilver using so much memory and/or CPU?.
 I'm used to Quicksilver in English and don't want it translated into my language. How do I make that happen?
Localisation is great, but if you want to keep Quicksilver in English, you can do this by running a simple command from Terminal.app:
defaults write com.blacktree.Quicksilver AppleLanguages -array English
Once entered, restart Quicksilver and it should be in (American) English only.
 Quicksilver's window keeps disappearing and won't stick. What's wrong?
Certain applications, such as Windowshade X and Spirited Away, are known not to play nicely with Quicksilver. See the list of Known Bad Applications.
 Why doesn't getting the Finder Selection always work correctly?
Unfortunately, this is due to a bug that only Apple can fix. See the Finder Selection article for more information and for a workaround.
 Why won't my triggers save?
- Triggers are saved in
~/Library/Application Support/Quicksilver/Triggers.plistif the permissions of that file or directory don't allow you to write, then no trigger will be saved. There have also been reports of this file becoming corrupted.
- If you have triggers using actions from some plugin and then uninstall that plugin, the triggers remain and QS can be confused. Sometimes a particular trigger doesn't display, sometimes only one of many triggers appears in the prefs. To fix, reinstall the needed plugins, delete the related triggers, then remove the plugin.
 Why does Quicksilver not install any plugins or hang when trying?
Check that your user account owns
~/Library/Application Support/Quicksilver/ and the Plugins folder beneath it. You can check and change this if needed in the Ownership & Permission section of the folder's Info window. (To show the Info window, either select the folder in Quicksilver's first pane and choose the Get Info action in the second pane, or navigate to it in Finder, right click on it, and choose Get Info from the contextual menu that pops up.) After making sure the folder exists and you own it and have permissions to write to it, restart Quicksilver.
Another possible cause is that you are running Little Snitch. LIttle Snitch is a reverse firewall that prevents applications on your computer from contacting websites unless explicitly authorized. To install plugins, configure Little Snitch to allow Quicksilver to contact the server where the plugins are.
 Why is Quicksilver using so much memory and/or CPU?
Quicksilver keeps the entire index in memory and scans the catalog sources regularly. Usually when it uses too many resources it's because the catalog is configured too large. The default
~/Documents/ source is configured to a depth of 2, if you create a custom source of infinite depth it will make the catalog large. Also if you configure a source for your home directory (~) it will probably scan many unnecessary files (
~/Library, etc.). This is also why your music and pictures aren't in the global catalog and should be accessed via the iTunes and iPhoto plug-ins which require you to type → to get into your music files and photos.
Also network drives configured to be scanned can make the catalog large. Note the "Find All Applications" catalog source (in the Applications set) will scan your entire machine, including network drives for applications.
If you have the "Clipboard Module" plugin installed and configured in the Clipboard Preferences to Capture History you might have large clippings in the history. This causes Quicksilver to use lots of memory. To clear it you can use the clear button in the Clipboard History panel.
 Quicksilver crashes! How do I fix it?
First, check to make sure you aren't running any Known Bad Applications.
Check the log in Console.app to see if there are any log messages or crash reports hinting at what might have gone wrong. Look on the left hand side for log messages titled 'Quicksilver' If you find some reports, send them to the bug tracker.
If Quicksilver crashes at startup, firstly try running Quicksilver with a disabled Catalog. This can be done by holding ⇧ when launching Quicksilver. If Quicksilver launches with no problems, then one of your catalog entries is problematic. Try disabling them in turn to find the problem. This is done by opening
~/Library/Application Support/Quicksilver/Catalog.plist and changing the 'Enabled' key for each entry to 'NO'.
If Quicksilver is trying to read a corrupt cache, this can cause it to crash. Try clearing the cache.
If this doesn't solve your problem, see if you have a
~/Library/Application Support/Quicksilver/Shelves/ folder. Quit Quicksilver, move it out of the way and start Quicksilver again. Sometimes the shelf gets corrupted or if you've copied a huge (say photoshop file) to the clipboard history QS tries to allocate huge amounts of memory and fails.
 How do I clear Quicksilver's cache?
If you start to see strange changes in behavior that was previously working fine, clearing out the cache will probably fix it. A common example of such a problem is when searching for something, you can only get an entry that ends in "(Catalog)". To clear the cache:
- Quit Quicksilver
~/Library/Caches/com.blacktree.Quicksilver/to the Trash
~/Library/Caches/Quicksilver/to the Trash
- Start Quicksilver
It may take a minute for the catalog to become repopulated.
 How do I back up or reset Quicksilver's settings?
Reinstalling Quicksilver doesn't change any saved configuration. Quicksilver stores all it's state in the following locations (~ represents your home folder):
To back up Quicksilver's settings, copy the first two items in the list to a safe location (e.g. your Desktop folder).
To reset Quicksilver to it's initial configuration, open the 'Application' section of Quicksilver's main preferences and click the 'Reset Preferences' button.
If your problem stops then you know it caused by something wrong in your previous configuration. Try copying items back one-by-one from your backup, restarting Quicksilver after putting back each file, until you find the cause of your trouble. Here's what the files in the app support directory do:
Actions.plist- list of installed actions
Catalog.plist- the configured catalog sources
Mnemonics.plist- learned inputs, defaults and abbreviations
PlugIns.plist- the list of available plug-ins and how they are configured
Triggers.plist- the configured triggers
Caches/- another cache folder
Indexes/- folder of indexed items
PlugIns/- installed plug-ins
Shelves/- where items on the Shelf and clipboards are stored
Actions/- not installed by default. The user can create this folder to add scripts that implement custom actions
Templates/- not installed by default. The user can create this folder to add template files to use with the Make New... action