Switching from ASP to ASP.Net

I had a Flash MX app that was working perfectly fine when interacting with an ASP page (which in turn talked to an Access database). Everything was fine… Then, I created aspx pages to migrate them to ASP.Net and the only thing I changed in the flash page was that the page pointed to .aspx instead of .asp in two locations. when i put breakpoints in my .net code, one of the pages gets hit and executes as normal. the other page, however, never seems to get hit even though i changed only the name in the flash program… i am confused as to why one would work and not the other… does anyone have any ideas?