HTML5 Upload Finishes with a Blank page

[netb]

I have followed the instructions here
http://documentation.coppermine-gallery.net/en/upload_troubleshooting.htm?expand_all=1#upload_support_step-by-step

When I upload a photo with the recommended HTML5 upload it sends me to the editpics.php, for example:

http://greatmusclebodies.com/editpics.php?album=416&newer_than=1498412428

But in the browser I get this blank page with message:

This page isn't working

greatmusclebodies.com is currently unable to handle this request.

I have created a test user as described in the docs. User is: tester pass is the same as username.

One time I got this error with the HTML5 upload:

stefito.ivanova.jpg
A valid form token could not be found. #1 /homepathfoo/uniload.php @179

The simple one file at a time upload method works just fine from the looks of it. 

[netb]

Moved all plugins to another folder and dropped just the default ones inside /plugins but still file upload fails.

These prints appear with the debug enabled:

/include/init.inc.php
Notice line 198: Undefined index: log_retention
/index.php
Notice line 370: Undefined offset: -1
Notice line 370: Undefined index: pic_count

[netb]

Looks like it was a combination of the old cpg 1.5x plugins not being compatible and caching from the host/CDN. At least I think so. Now it looks like everything is fine. It was a very strange issue.

[ron4mac]

Glad things got resolved. Thanks for reporting back.