unexpected error occurred

[GabFi]

Hey there, i've a problem.
I've installed the last version of MB coupled with the last patch. Everything seems to work properly but when I restart my pc and run MB again it is not able anymore to play any track. In particular when i double click on a track it appears the following message

An unespectd error occurred: The type initializer for
'#=qPC3T5r5DiZaoQXFT$5oExg==' threw an exception.

The only way to temporary overcomen the issue is to re-install the program, so that it is going to run till next restart

Thank you for the helping me

[boroda]

post full error message. just click a 'copy' button in the error window to copy mesage to clipboard.