It causes all sorts of problems with the compression software I want to install (really increases speed). It might be crashing your browser because of an addressing conflict - one of those things that works 99 times out a 100, but occasionally just doesn't. Asp creates a virtual address for the page but, because of the way the Crossword software works, I also have a real folder at the same location.
The solution is probably to move the crossword to another location and just link to it, rather than have it embedded in the site. This would solve both problems and only create one new one..