Just a quick update. The author got back to me to say that I should check that I have the latest versions of the driver and codec I replied that I do have the latest versions. No response so far...
In the meantime, I've come across a capture software that does the trick - AVS Video Capture. It's available from
http://www.avs4you.com/video.aspx and it's free! It comes as part of a full suite, which you need to pay for.
Hope this helps.
PS, I'll keep you updated if I get any response on AMCap.