RT 3.4.5 upgrade problem

I upgraded to 3.4.5 and now my RT is broken. The error log indicates:

FastCGI: incomplete headers (0 bytes) received from server

I’ve found little info regarding this error. When I su to the RT user
and execute mason_handler.fcgi it runs fine and returns the html for the
login page. Has anyone seen this and/or know what I need to do to fix