Hmm, I'm not sure why Camtasia crashed on your computer, it was quite stable for me. I also didnt notice any framerate issues, but then again OP2 only uses 1 core (I assume since its so old).
Also check out hypercam, its free but it puts a nag tag in the lower part of the screen. If you want, I can go on IRC, but as of now my time is stretched thin, until the end of February. Sunday is probably the best day for me.
I encourage to show him my tutorials, Check my sig for them.