I have the same problem with QPC2 v4. It won't read QL floppies with either density which can be successfully read by QPC2 v3.12 and native QL+Gold Card. I'm using Windows 7. Will try XP later, I'll let you know.
-- UPDATE --
I've installed QPC2 v4.02 on XP and that solved the problem! So don't throw away your old XP machine yet...
QPC2 and physical flp1_
- janbredenbeek
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