I have just downloaded 22.214.171.124 of Qcad pro, cool enhancements on the face of it, the help documentation is also upgraded, all in all looks like you have been busy. I have used QCad succesfully on Windows XP in the past, this is my first serious attempt to use Qcad on my new shiny iMac.
But, alas, it looks to me as if the mouse behave rather erratic. The scroll wheel works fine, but I can not grab the scroll bars with the mouse using left click, oh, that reminds me I am using a Wacom tablet with a regular 2button mouse, scrollwheel, etc. Is there any special settings to make Qcad more Wacom tablet aware on OSX?
Ideas, help appreciated.