Here is the setup : Win 7 SP1 x64, 16Gb RAM
iFolder (Simias) is repeatedly crashing with the following error : System.NullReferenceException
Message: Object reference not set to an instance of an object.

StackTrace: at Simias.Sync.InFile.Close(Boolean InFinalizer, Boolean commit)
at Simias.Sync.InFile.Finalize()

I've tried to disable the antivirus (Avast) : no change.

The Computer is "up to date" as per Microsoft Windows update.

Nothing obvious in the logs ...

Any clue would be much appreciated.