It might be helpful is someone else who is experiencing this would run the debug also.
I just ran the debug version, very quickly got the error and pm'ed the log file.
A pretty standard portable (test) installation, not tweaked much, a very small library on local drive, same partition as the install.
Just a thought, perhaps regional formatting plays some role?
(I am using Windows in English, but have the regional settings for date time etc. in Dutch. Differences in dots and comma's and such)