21.5-b26: autoloads already loaded errors?

I've noticed that 21.5-b26 complains a lot about autoloads already loaded. This didn't happen before with earlier versions. I think this happens because I have in .xemacs/xemacs-packages/lisp modified versions of packages that xemacs already supplies. For example, I have a personal, modified version of pcl-cvs. Is this expected behavior. It doesn't seem to affect operation, but it's a bit annoying and disconcerting to get a Lisp backtrace everytime I invoke an autoloaded function for some package which I've intentially shadowed. Ray