Has anyone figured out whether timeshifting is working with SF img 1409 and the latest one test_0510 ?

What happens is that I record for 30 secs, I press Pause for about 30 secs and I press Play, the timeshifting is playing back for about 5-10 secs and suddenly it goes immediately back to time -0.0, the screen becomes black and after it shows me what I'm recording without time shifted, the record is still in progress, but the shifted playback is dead !!

With image 1.06.5 from multimedia it works without any problem ! Is it due that the latest image is a test image and not a final version or is it redundant problem ?