First post so please be gentle...

I'm new to Image Mapper 4.2 and have just noticed some odd behaviour in the Design View and wondered if it was just me...
When playing with a .png file in the Design View the zoom tool doesnt appear to work properly, it zooms the map but not the image, jpegs and gifs appear to be fine (I would have attached a screen grab to illustrate but can't seem to

Am I missing something?
Cheers!
Andy B.
Running on Windows 7 Home Premium 64 bit