Problem loading expectation

[Vladimir Prus]

Hello,
seems like CVS HEAD cannot load expectation file written by previous QMTest 
versions. The symptoms are that I specify -O option but no expectation appear 
anywhere.

Debugging further, I see that PickleResultStream.GetResult catches 
cPickle.UnpicklingError exception, which, when printed, reads:

    unpickling stack underflow

I don't really know what this means, and don't know what to do about it. 
Anyway, is this a known issue? I see some code for handling different 
versions of pickled result stream, so maybe it's just a bug?

- Volodya