after updating all of my WebMin boxes (about 30), I cannot login to them from the "Webmin Cluster Central". I have one box where I define all the others via menu entry Webmin -> Webmin Server, and from this page I cannot login to the other boxes any more. The only thing I get to see is the error "Bad PATH_INFO : /right.cgi" in both panels of the window.
Since I used to login to several other boxes to schedule downtimes and so on, I consider this a "feature" that came with the 1.670 release.
The central update of all modules does work, so the RPC calls seem to be OK, but the interaction became unusable. Logging in directly, without going via the Cluster Central, works as well. I use https on all boxes for years, btw.