php version 5.3 to 5.2 cant login

[motokochan]

Possibly, it's related to PHP's crypt() function. Without knowing how it was built, it is possible that the build you are using only supports older DES hashing.

The RPMs for PHP 5.3 in Remi's repository support more hashing functions. (They support MD5 for sure, which is used in preference to DES - see the note in the above link about built-in support for PHP 5.3.) ispCP Omega will use the strongest method possible for the PHP version that is running.

The only real solution short of moving back to 5.3 is to reset all passwords, which will generate compatible hashes for the build of PHP you are using.