Hello - you might want to provide information about your computer (model/year) and the OS X that is installed. First, about an app that your removed that is still listed in 'Launchpad' - was the program removed completely? Also, please provide the name of the app - others may be able to help more effectively. And a computer 're-boot' might help.
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All perfectly reasonable requests.
I am working on an early 2013 MacBook Pro Retina running OS X 10.9.4 with a 512 GB SSD and 16 GB of RAM. I also have Parallels 8 installed running Windows 8 although the app is a Mac app.
The application that I removed had to be removed manually as it did not have an official uninstall app. As far as I know the app was completely removed but apparently something may be laying around somewhere. I have checked the Applications and the two Library/Application Support folders and removed anything that appeared to be pieces of the app but that did not remove the app from my Launchpad. The Launchpad app itself understands that it cannot run the app as it has a big question mark where the app icon should be, but it is still there.
Second and just to ask a simple question - do you have more that a single page on your 'Launchpad' screen (see arrow on pic below), i.e. the newly installed apps may be on another page. Dave
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I have multiple pages in my Launchpad (4 pages although I could combined them into 3 full pages) and the apps do not show up anywhere in them. I have scanned through all of the pages looking for the apps but did not find them anywhere. The missing apps are less of an issue for me than not being able to remove the uninstalled app. I can, of course, always start a missing app using a desktop icon (which is what I normally do) and not bother with the Launchpad itself.
I am sure there is a reason for all of this. I assume that Launchpad has some internal folder or file information that it keeps listing all of the apps that it is accessing and, if I could find out where that is, I could probably at least gain some information about what might be causing these problems, but I cannot find any of that information on my system. I am sure it is there, perhaps in a plist or some file or structure I don't know about, and that was why I asked the question.