Trouble moving store between servers

I just finished doing development for a client on my test server and did the normal 'export/import' of the database and archive/move/un-archive of the site files on the other server. For the most part everything is working fine, except my HkaShop. Any call to the shop at all produces a blank screen and the only code that gets spit to the page has something with:

The strange thing is in the backend of the Hikashop some products come up, but others produce the same 'blank hang' when you click on them. I thought perhaps there was possible corruption in the file transfer process, but I attempted it twice, with different SQL files and site file archives.

For all intents and purposes the two site environments are identical, both linux servers, both running Apache, both running PHP 5.3, but my test server was running MySQL 5.0.96 (I can't tell if that's the libmysql version or software version) and the new production server is running 5.5.33 - libmysql verion 5.0.96 (should that make a difference?) There isn't really any other difference for these two Joomla systems as they are identical in build on both ends.

I'm really in a bind here

Oy, ok, so after turning on the debugging for the new Joomla I discovered that there was a script memory problem - Fatal error: Allowed memory size of 67108864 bytes exhausted (tried to allocate 87 bytes) in the mysqli.php database script. As per some other suggestions I set the memory size of that up to 100M, as I can't adjust the max memory size for my PHP above 64M. Using: ini_set("memory_limit","100M");

Is that all that would cause everything to fail? Is this safe to do? Things seem to be working normally now.

If the blank page causes is a memory limit fatal error, then yes, increase the memory_limit is a solution and safe to do.