Boxcryptor problem

Based on Searching resulting in 'Not Responding' [Boxcryptor icon overlays], their shell extension was causing problems back in February at least.

I don't know if it's still an issue or if they've made some fixes on their side. (We could not debug it either way as the problem is inside their DLL which we don't have the source to.) If it is still a problem, their icon overlay shell extensions can be disabled as per that thread, to remove the issue.