Sometimes I write blog posts to remind myself how to fix problems that I hit. In a couple of years I'll search for this problem and find this post. And then fix the problem again.
It's happened before.
I love Photomatix Pro. I use it to make my pictures a bit more interesting, and to create HDR shots. It works very well. Except that for the last week it's been crashing out when I try to save the image. Turns out to be my external plug-in memory card reader. If that is connected it gives what Photomatix thinks is a drive D: that doesn't actually exist. This does not end well, but if I unplug the reader it all just works. Yay.