Olly freezing

Theres a spacific program i am trying to debug... I got it unpacked with an automated unpacker (aspr 1.2x) and partially cracked it so it would actually run in the unpacked state. The thing is, sometimes (75% of the time maybe) when i load it in to olly, start it with f9 and then pause it with f12, olly goes bonkers and freezes. I know the other program is supost to freeze because its paused, but why olly??
Its driving me nuts, I cant get anything done!