I just upgraded from Jcow pro 4.2.1 manually to 4.3 and installed the forum.
When I create a thread with a poll, I get a error:

Unknown column 'stream_id' in 'field list'

Anyway, the thread is started, but it is impossible for users to reply to the thread. It just shows the error:

wrong pid

When I look in the DB no pid is created in the threads, but everything else seems okay.

Hope somebody can help

Jan