Problem with jpg-files

Whenever I go in DT on a jpg-file the program slows down, the spinning beachball appears and the document window occasionally shows some weird graphic chaos. It takes the program almost 15 seconds to display a file of 4 MB. That definitely looks to me like a bug. Any explanation? Does it have to do with the fact that I am still on 30-day trial?

This is a bug of the ImageKit framework introduced by Mac OS X 10.6.3. Version 2.0.3 of DEVONthink will include a workaround.