Stuck on "Preparing confirmation dialog..." window

[RVA]

MMA stuck on "Preparing confirmation dialog..." window for hours, in the latest 291 build and on previous versions too. I have my music collection (4630 songs) on external sdcard already. I reinstalled the MMA so all databases are removed and have to be rebuild. MMA starts syncing, matches files on sdcard to files on the server and than sits on "Preparing confirmation dialog..." screen forever. I tried doing it several times, the last time nothing happened after 4 hours of waiting. Any ideas?

[Lowlander]

Cancel sync and send log from MMA (from About screen). Do make sure you're on MMW 4.1.3.

For me sync is working so far (it's been running for 16 hours due to video sync).

[RVA]

I did send the log, with the same "Stuck on "Preparing confirmation dialog"" comment in the description. But I can't cancel the sync, it doesn't respond to cancel requests.