Re: QWT fails in debug build
Steve,
I believe that you must build a release build of your Qwt libraries to use it in an application built for release, and the same goes for debug (build Qwt for debug if you want to debug build your application). Qwt must be built the same as your application, if I recall correctly.
So basically, that problem is normal and is to be expected. Windows does not like letting debug and release libraries play together.
Chris
Edit: Woah. Just realized how old his post is. Oh well. Hopefully someone else will benefit from this.