php 5.4 fatal error, Allowed memory size of 83886080 bytes exhausted

[gsmsalers]

I also started experiencing same problem after I migrated to Godaddy "Ultimate" shared hosting from another Godaddy hosting. I copied fixed version of "session.php" from github. But problem persist. FYI: My zen cart version is 1.51
Here is error message from Godaddy when I try to login. It stuck on below blank page.
/index.php?main_page=login&action=process

"Internal Server Error
The server encountered an internal error or misconfiguration and was unable to complete your request.
Please contact the server administrator at [email protected] to inform them of the time this error occurred, and the actions you performed just before this error.
More information about this error may be available in the server error log.
Additionally, a 404 Not Found error was encountered while trying to use an ErrorDocument to handle the request.
"
Here is Zen cart log.

[26-Nov-2013 01:24:40 UTC] PHP Fatal error: Allowed memory size of 67108864 bytes exhausted (tried to allocate 693694233 bytes) in /home/xxxxx/public_html/includes/functions/html_output.php on line 62
"
Is there any other fix?

Changes committed to github: https://github.com/zencart/zencart/c...6deb80026d2886