What OS are you using? I'm using Win7 64 bit, I wonder if some of these programs have problems under 64 bit. I remember once before having problems with audio/video timing in a previous version of Camtasia.
If you have 2 monitors does it matter which one you use to capture, maybe my problem is from using the secondary monitor instead of the main one?
Thanks again for your tips! I will try again to make a good video tomorrow.