Running the MMF2 Dev demo on Vista, I've come across a couple of bugs. Thought I'd mention them.
When dragging the properties window (or any similar window) in to its own floating box, the title in the blue header bar is half hidden behind the Grey tool panel - it doesn't cause any real problems, but it's irritating. I also have problems selecting layers in the layer manager - if I select one layer (as normal, it highlights in blue), then click on another - they all remain blue. Selecting layers then becomes difficult, they just won't change when trying to select them.
These problems have been fixed, you must be running an old demo version. Re-download it, it has been updated to the latest build (247) in December.
The bugs haven't put me off buying it, but the price has! Oh stuff it! What's £229 anyway... wipes dust from credit card.
The standard version of MMF2 is £70 (I think), if you can't afford the Developer version.