I am having a strange problem. I am porting an asp.net web application to sharepoint (as a web part) and I've converted most of it to a webpart that loads an .ascx user control. However I have some pop-up windows that I've left as .aspx pages.
This works fine under MOSS 2007 on Windows 2003 server, however, when I install the same package on Win 2008 64 bit, MOSS 2007, the web part works fine, however the popup .aspx page does not.
In Page_Load I am looking for something stored in the Session object and here it is mysteriously null. In the webpart it is ok.