Caprine is loaded, but won't show the window. I can hover over the icon in the taskbar and the quick preview shows a tiny window, but clicking on the preview in an attempt to bring the window into focus does nothing. Reinstalling using the install repair function of the Caprine installer and the uninstaller function in "Add/Remove Programs" within Windows also does nothing to fix the issue.

Only by deleting the contents of C:\Users\User\AppData\Roaming\Caprine (it was 950 megabytes, by the way; on a fresh install it's 20 MB) and then reinstalling was I able to fix the issue. I'm making an issue to help anyone else who has this problem resolve it, since many will assume a reinstall will fix the issue. I recommend that the uninstaller and installation repair tool be updated to give an option to clear the cache and other temporary files that may cause weird issues like this.