Quote Originally Posted by lhungil View Post
That little bit of code in the .htaccess from Ultimate URLs is what handles non product / category / EZ pages. Removal will break handing of pages such as privacy, shipping_info, etc if rewritting is enabled for those pages. Not a big deal if you disable rewriting of all the other pages... But in and of itself that rule will not be the root cause of a "blank page".
I am only using the rewritting for my product pages so at least I know I did not do any major problems deleting it.

Quote Originally Posted by lhungil View Post
You may want to enable "autoload" debugging in Zen Cart to see if an error is occuring during autoload or modify your php.ini to log all PHP errors to file (will catch all PHP errors including before Zen Cart's file logging is loaded / enabled).
Will have to look up how to do this.

Quote Originally Posted by lhungil View Post
As for CEON URI, that error is a new one to me... Although I've not used any versions past 4.4.0 (2012)... Has the paypal cancel URI changed? Or is a different one specified somewhere in settings on paypal?
Nothing had been changed in Paypal.

Quote Originally Posted by lhungil View Post
Also on a side note, if your site was well established w/ good ranking on SEs... After changing the URLs you will probably want to redirect (or rewrite) the old URLs to the new ones...
Probably.... Is there an easy way to do it with a couple of hundred products?