Some people have experienced login problems again.
The forums data have been rebuilt again so hopefully it is resolved.
However it is a good idea - whatever PC you use for the forums - click 'keep me logged in' or 'remember this password' in your browser.
I and many others have not trouble logging in because I simply never log out.
Meanwhile: The whole forums will be upgraded in the foreseeable future as we are moving to a new data center and a new high power server for both the main site and forums. (We will also be migrating the forums into a different program. )
Thanks and apologies to those inconvenienced.