Вышел первый hotfix для MOSS 2007. Полное описание - http://support.microsoft.com/default.aspx?scid=kb;en-us;931497

Issue that the hotfix package fixes

This hotfix package fixes the following issue that was not previously documented in a Microsoft Knowledge Base article:

When you build a Web site that is based on SharePoint Server 2007, the Web site may intermittently show incomplete navigation menus.

Note This problem is difficult to reproduce consistently and requires the server to be under a heavy load condition. Under this condition, a ThreadAbortException may be thrown while the navigation system is initializing its list of items to display during navigation.

This cached list may be only partially populated when the exception occurs. However, the list persists anyway. On successive requests for this list of navigation items, the partially populated list is taken to be complete. Therefore, several items may be left out.

This problem will continue to occur until a change (write) causes the cache to be reinitialized or until the cache is manually flushed.