I use a 4224. Just a simple square wave - maybe 30 cycles of about 600uS pulse width variable by about 20%. About 3 sets captured. Nothing too large I don't think unless I'm doing something wrong or just badly.
Can you think of anything I may not be doing that could cause this? I notice no one else has mentioned this so it could well be me.
I usually set for falling trigger +/- 5V and various timescales with repeat capture on.
Based on the fact that you are only getting three captures in the buffer, I would guess that your sample rate is very high. Check the properties tab to see. You can probably turn that down quite a bit. This would result in much faster updates and many more captures in the buffer.
_________________ Tom Roberts (The Picotologist) http://www.autonerdz.com skype: autonerdz THE PicoScope Automotive Authority In North America