Acronis True Image 2012 + Boxcryptor fails

Hello,

I used Acronis to backup my boxcryptor drive for a long time. It's mounted as a network share filesystem FAT32. I upgraded Boxcyptor and now Acronis doesn't manage to backup it any longer. It says it can't find drive P:\ but it is readable without any problems..

I attached the log. Can anybody help?

Regards
Andy