Mailscanner 4.50.12-2 upgrade stops working

[Patrick de Brabander]

I´ve installed the new beta 4.50.12-2 over my working MailScanner-4.50.10-1.
New mail in arriving in the mail box and in my log file is see the following
 
Jan 28 22:57:51 server MailScanner: MailScanner -15 succeeded
Jan 28 22:57:51 server MailScanner: succeeded
Jan 28 22:57:52 server MailScanner: succeeded
Jan 28 22:58:00 server postfix: succeeded
Jan 28 23:14:06 server postfix: succeeded
Jan 28 23:14:14 server last message repeated 2 times
Jan 28 23:14:23 server MailScanner: MailScanner -15 succeeded
Jan 28 23:14:23 server MailScanner: succeeded
Jan 28 23:14:34 server last message repeated 3 times
Jan 28 23:14:39 server root: MailScanner setting GID to postfix (89) 
Jan 28 23:14:39 server root: MailScanner setting UID to postfix (89) 
Jan 28 23:14:40 server MailScanner: succeeded
Jan 28 23:15:35 server postfix: Process did not exit cleanly, returned 255
with signal 0 
Jan 28 23:16:08 server last message repeated 3 times
Jan 28 23:17:14 server last message repeated 6 times
Jan 28 23:18:20 server last message repeated 6 times
Jan 28 23:19:26 server last message repeated 6 times
Jan 28 23:20:32 server last message repeated 6 times
Jan 28 23:21:39 server last message repeated 6 times
Jan 28 23:22:45 server last message repeated 6 times
Jan 28 23:23:51 server last message repeated 6 times
Jan 28 23:24:57 server last message repeated 6 times
Jan 28 23:26:03 server last message repeated 6 times
Jan 28 23:27:10 server last message repeated 6 times
Jan 28 23:27:21 server postfix: Process did not exit cleanly, returned 255
with signal 0 
Jan 28 23:27:22 server postfix: succeeded


Can somebody help me.

Is it possible to go back to an older version. 

Thanks

Patrick