The thing is, I tried to upload the new 4.2 files at least a week ago, and the first editing-related problems have occurred only today or yesterday. I'm typically posting daily and occasionally editing and did not notice any issues until very recently. So I'm not too sure that it's related to the upgrade. After all, I'm currently running on the backup that I saved before attempting any installs a week or so ago.

it would not hurt to try

I've upgraded to 4.2.2 successfully, but now am getting some errors. I've looked around, again, but I can't seem to find a good solution.

In every page, I get 2 warning errors:

Warning: Non-static method THANKS_CACHE::init() should not be called statically, assuming $this from incompatible context in ..../dbtech/thanks/hooks/global_start.php on line 9

Warning: Non-static method STATUS_CACHE::init() should not be called statically, assuming $this from incompatible context in ..../dbtech/status/hooks/global_start.php on line 9

At AdminCP I get the warning errors plus:

Unable to add cookies, header already sent.
File: /home/content/94/9082694/html/forum/includes/class_core.php
Line: 5745

So I added the DISABLE HOOKS line in my config.php, which lets me get to the forums and admincp. My edit post ajax problem seems to be fixed. But there's a bunch of notices about outdated templates and failed merges, and I still have the errors related to global_start. Do I need to reinstall plugins one by one to fix this? I've seen other people's similar problems with 4.2.2, but I'm not sure how to resolve this.

you need to upload the fixes for 4.2.2
post 24 and 26

I believe if you download the latest copy of v4.2.2 the "class_core" changes have already been implemented.

See this post from @PaulM...
https://vborg.vbsupport.ru/showpost....0&postcount=90

Just in case you have not enabled it :)

The first two errors can be solved by uploading the files for those two mods again. They were patched on here some time ago.

I applied the changes according to these two posts, and the edit function, as well as the forums and admin CP, seem to be working fine. I truly appreciate the quick responses and support from you all, thank you! :)

Now all I have is some template updating to do to fix my skins, and I hope everything else is taken care of now.