MyBB Community Forums

When I try to access Templates and Styles in the ACP, I get a blank page...

You probably have missed ACP files.

Re-upload style folder and its files in ./admin/modules/

Files in /admin/modules:
editorthemes.php (plugin)
index.html
module_meta.php
templates.php
themes.php

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Here are the plugins I have installed:

Awaiting Activation Message (1.6)

Advanced MyCode Permissions (1.2)

Additional Usergroup Images (1.1)

Auto Media (1.1.9)

Custom Status (1.7)

Fit on Page (2.3)

Disable Flood Time in Posts for Groups. (1.0)

Google Analytics (1.5)

Google SEO (1.1.13)

Group Post CSS (2.0)

HTML in Posts (1.3)

HTTP Status (1.0.1)

Mods Cant Edit Admins Posts (1.0)

Menu Manager (1.0.2)

ModNotice+ (1.3)

Multiple Registrations Detector (1.1)

My Permissions (1.1)

MyShoutbox (1.5)

Page Manager (1.5.2)

Profile Comments (0.9.0)

ProStats (1.8)

Quick Reply PM (1.3)

reCAPTCHA Plugin (1.1)

Rules Page (2.0)

Soft Delete (1.24)

Simple TagCloud (beta) (0.9a)

Style Usernames (1.2)

Thank You/Like System (1.2)

Thanks for the report (1.0)

View Groups (1.4)

VIP Membership (1.5)

Welcome Guest (1.5)

Welcome PM/Email (1.1)

MyBB WYSIWYG (1.0.2)

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When I use Google Chrome (normally use FireFox), I get:
HTTP Error 500 (Internal Server Error): An unexpected condition was encountered while the server was attempting to fulfill the request.