I was speaking to someone today who runs a DotNetNule 4.4.0 site. He has "more than occasional" problems that show up as critical errors loading the login module when clicks the login link on a page on his site.
Otherwise, the site runs fine ... at least for non-logged-in users, who comprise the bulk of viewers.
The fix is to restart IIS.
Has anyone seen this, and/or know how to fix it?