I just installed Jv 16 Powertools (licensed version) and immediately ran into this cache problem:
The original version closed the program when I chose to update the file cache.
The "test" version hangs when I choose to update the file cache.
FYI, I do have some USB and Firewire drives on my computer, but I disconnected them and it did not help.
As a new user, it is disconcerting to install software that immediately has problems. I know I can use the program by selecting not to update the cache, but that seems to disable an important part of the process.