Blank Configuration Pages in Admin

Recently updated a store from 1.3.9 to 1.5.4. The update worked flawlessly, fully tested the site for functionality, no issues. Installed several plugins (all of which were confirmed to be updated via the page for updated 1.5.4 plugins. These plugins had worked 100% correctly on another store, which is why I installed them in bulk this time around instead of checking between installations.

However, now when I click on any of the pages under Admin - Configuration, I get blank pages. Every single one of my Configuration pages (/configuration.php?gID=1 on) are blank. The Configuration section is the only part of my Admin settings that is like this; everything from Catalog-Extras works normally.

My question is: does anyone know what's causing this issue and how I can fix it? I have a full database backup that I can restore if I need to, but it was done prior to all the plugin installations and I'd rather not have to do them all over again if there's an easy fix.

Thank you for any help!

A white page means you got a debug file in your logs folder. Please post the contents of that (last) file, and we may be able to help you further

The only log file I have timestamped yesterday (when I did the plugins) was a notification about Easy Populate not having a temp folder. Other than that, there's the installation log from the upgrade, but like I said, everything worked fine after the update.

Does your copy of "/admin/configuration.php" differ from the stock copy in the Zen Cart 1.5.4 Zip archive?

You may also find more information in the server error log or by enabling STRICT_ERROR_REPORTING.

Miyabella:

Installed several plugins
Please list them all