Quote Originally Posted by Fungai View Post
For me, Image Handler 4 doesn't work with a site that's already populated. I would not recommend installing it unless it's a fresh Zen Cart install.
I have done several upgrades on sites with IH installed, which means uninstalling the plugin, doing the upgrade, and installing the current version of the plugin. This works. I would have to surmise that the issue is conflict with another plugin you have installed or some piece of customization. The mere fact that there is content in the store does not preclude installation of IH.

Quote Originally Posted by mc12345678 View Post
Further it seems from the description that the issue was with the admin side not the entire store. The admin side could have been addressed independently without rebuilding everything.
Definitely. Check the log file - there are several places on the Zen-Cart site that tell you that when you get a white screen to check the log files. You may immediately recognize the error reported, in which case you could have fixed this before several days of frustration. If you can't recognize the problem immediately, don;t worry. Just post the log to this board as suggested immediately after you initially posted your problem. Someone here may have seen that exact problem before and be able to give you the fix or the developer may be able to translate the log for you and give you specific action items - or at least let you know what may be causing the conflict. It is possible that the issue is with one of your other plugins or themes, and you may need to check with support for that add-on...