While trying out mga6 sta1 isos, I found that there were MD5SUM errors during the process of adding online media in the Mageia installer. The workaround was to specify a mirror manually. I didn't worry too much about it because it is cauldron.
But yesterday I went back to some Mageia 5 VMs that I hadn't used in a while, and I found that the same MD5SUM error was occurring while trying to update media, and I was forced to remove the "Mirrorlist" media and specify a single mirror instead.
Is there some breakage with the mirrorlist feature?