The "(diff)" links on my recent changes RC views on all of my wikis are not working, I mean they link to the difference of "current version" MINUS "current version", which is zero of course

Example content of "(diff)" links in RC view http://myserver/mywiki/index.php?title=Main_page&curid=605&diff=1217...

I have this since I migrated in the normal way i.e. running the scripts and following the instructions from 1.2.6 to 1.3.1 . The freshly installed 1.3.2 has the same problems.

Can someone help me ?