Thread:Project:Support desk/No login page after 1.21.3 to 1.22 upgrade - Uncommitted DB writes?/reply (5)

The "Uncommitted transaction" problem only is a PHP notice. As far as I can tell, a notice should not be able to produce a blank screen. When you see a blank screen, or - as you added above - a server error 500, then something else must be the cause.

Check the server error log to get information about the server error 500!