You are right, after trying Update Plugins a few times, and installing a few plugins to test, I'm not getting the HTTP-Referrer error anymore.

It worked! Thank you for being persistent!

Powered by Serendipity 2.3-beta1 and PHP 7.3.3

Is the Update Plugin HTTP-Referrer string error, and the CheckSum error anything the try to fix?

Line 128 of templates/2k11_myfork/admin/upgrader.inc.tpl
I also verified that this is the same code on line 128 of my regular 2k11.

Also, something else I just noticed, in 2.1.5 when clicking Verify Installation Integrity within Maintenance, I get the error I verified the file is there, but it is an blank file.

I indeed was able to update the Staticpage plugin and that cleared the debugging errors in 2.1.5. Although there's something else that's been fishy with my plugins...when I click Update Plugins , I get the error below. Clicking Update Plugins a second time normally clears it. I've checked that it is...

Below is what appeared after adding the debug line to serendipity_config_local.inc.php . Also a separate Smarty Debug Console popped up as well. #0 errorToExceptionHandler(1, Uncaught ErrorException: Warning: Use of undefined constant INCLUDE_ANY - assumed 'INCLUDE_ANY' (this will throw an Error in ...

Hi Onli! Thank you for helping with this. The first part regarding the stacktrace I have never performed before and would need a walk-through, but the second part regarding changes to the admin area...there are changes I made some time ago. Here are what notes I have on what was changed. Unfortunate...

Hi! When trying to update from 2.1.5 to 2.3 Beta1, I get the normal screen that states, "Serendipity has detected that your currently installed Serendipity version is 2.1.5. It seems you are attempting to upgrade to version 2.3-beta1, so you need to click here to continue the upgrade process." After...

For what it's worth, I've been running 2.1.4 and php 7.3.0 for quite some time now with no known ill effects.

Hi Don! I wanted to let you know that for all the years I have been using 2k11, I've always had to keep notes of what I changed, so when I updated I would know what I needed to change back that was lost. Your instructions here are so clear, that I absolutely jumped on board following your instructio...