Dopus 10 (beta) crashes

I have Dopus 10 installed, which crashes every time I want to access a certain directory. I installed the beta version today, but it still happens.
THe funny thing is that it only happens with this specific folder (D:\Inbox) and not with other folders on the same partition.
Any idea what cause this behavior?
I am running Windows 7 x64

FAQ: Crash, exit or high CPU when viewing a certain directory