I have been using Start11v2 since it was introduced. I have never had any issues until I installed 2.4.9.0 over the previous version (2.1.1.0). I tried both the uninstall/reinstall, and purge and reinstall, neither of which helped. I ended up doing a hard uninstall by removing the Start8 folder in the Stardock registry settings at "Computer\HKEY_CURRENT_USER\Software\Stardock\Start8", deleting all the Start11 folders from Program Data, App Data>Local, and Program Files (X86). After rebooting and a clean install and activation of 2.4.9.2, everything was working as expected. I used a backup from before the original install of 2.4.9.0 to restore my settings, and had to spend very little time getting it back to where it had been before.
If you try to restore your settings from a new backup, you're liable to reintroduce the same issues again. Make a new backup just in case, so you can at least get back to where you were.
This would be a last case scenario, if nothing else works.
I am a hardcore Stardock user and run most of their top tier programs on my system. I very rarely have any of the issues that others report, but this case was the exception.
Hope you eventually get to a solution. It's definitely worth it.
pelaird