We have a a MUWP install that is geared towards music. We were attempting to import 1300 artists, as pages, into the main, www, blog. This apparently is too many pages for WP to handle as it the site works but those specific pages will not load with a strange error. Also, the Page Manager in the Dashboard will not load and it will kick you back to the page you were on before. I deleted 1250 of the 1300 pages and everything worked fine.
So, my question is, is there a limit to the number of pages that WP or WPMU will support?