Skype keeps crashing on connect in Sandboxie

[moo]

Sandboxie v3.76 (64 bit, unregistered)
Windows 7 Pro (64 bit)

Skype: I have tried different versions (v5.x and v6.0, v6 portable, ...). Installation works fine, though after giving skype username and password, windows tells me that there is a problem with Skype.exe and it will be terminated. Nothing in the event log, though.

Any idea on how to get skype working in sandboxie is apprechiated. I have read through many threads but I couldn't find anything helpful, yet.