Whenever I run the cleaner in CCleaner, Clipmagic crashes with an error about the database. I can avoid the problem by closing Clipmagic before running the cleaner. Unfortunately I forget. And if I forget, I can't get Clipmagic running properly without deleting the "categories.qdb" file. If you are having the same prob and don't know where "categories.qdb" is found, run a search for the file on your computer. Once deleted, Clipmagic will run normally again.
Anyone know why this happens?

Not familar with ClipMagic myself, but, in CCleaner, do you happen to have the "Clipboard" check box ticked in the Windows > System section?

If so, try UNchecking it.

I can see where that might produce a conflict.