PHP 5.4 does not let me log into admin

[brettb76]

I have a 1.5.1 install of zencart with Hostmonster. I received an email that they will be discontinuing support for PHP 5.2 and shifting to 5.4. I logged into my control panel and changed PHP setting to 5.4 to test it would work as per their recommendation.

The website works fine but I cannot log in to the admin section. After entering the username and password I end up back on the same login page with the username and password textboxes blank again. I have tested this on 2 different PC's at 2 different locations with the same result.

While I had it on 5.4 I used SQL to reset the password and also to add a new user but neither of these things worked. I have checked the logs and cache folders and there is nothing there. The Hostmonster PHP Config page shows this message.

PHP 5.4+ Incompatible Applications Installed
Application Name Version Path
ZENCART 1.5.1 /home2/xxxxxxxx/public_html/au

I changed back to 5.2 and it logs in perfectly. I don't know when support will be dropped but I need to get this resolved.

Please help.

[lat9]

Are there any debug-log files present in your /logs directory?