AFter i upgraded, I get error, Security issue, the request seem invalid ! Try a new login and retry. [logout], when I try to log in to LMS.  Any ideas??

hello,
about this problem please note that new patches have been made available on the bugtracker; could you please apply them and let me know if you still have this problem? Thanks.

Moreover: are you using a custom template / custom ("hand-made") form to login?

bye,
Giovanni.