500 Server Error After Upgrade To WordPress 4.0

I’m having the same problem. Just upgraded to 4.0, and the majority of my blog posts on the front end are giving Server 500 errors. Everything in the back end is working just fine.

WordPress 4.0
theme: Thesis 1.6
a few plugins, all are current
hosting on hostgator

I’m going to contact hostgator and see if it’s anything on their end. ditesco, have you had any luck fixing your site?

jdstudios… Nope, I actually had to revert back because I have not yet found a fix.

I actually am also on Thesis. If you find a fix, let me know. That would be great

I am on Thesis 1.8.2, having the exact same problem since upgrading.

Same as you guys, I upgraded to WP 4.0, then installed wiki plugin, and right after I did so, I can’t access my dashbord anymore. My website works well, all pages are loading properly, but I can’t access my dashboard!

I just up loaded 4.0 and all I get now on my wp page is my theme and title to my last blog, that all I get when I click on the title I get a blank page yet when I click on publisher name it takes me to the wp page.
https://www.wildflowersaromatherapy.com/blog/

Same here. After upgrading to 4.0, I’m getting 500 errors on my front end – almost every post and page, but not all, and not the homepage. Any help would be great!

I’m just reloading an old WP file I had saved and all is ok now, will wait for the 4.0 to be fixed before reloading

Could this be NOT a WordPress issue, but a THESIS theme issue?
I’m running Thesis 1.8 and was dreading the day I would need to “upgrade” to version 2.x.

This IS a Thesis issue and they have fixed it already. Here is how you do it (derived from Thesis support, did the trick for me):

NOTE: You must be using version 1.8.5 before deploying this fix; if you’re still using an outdated 1.x version, then you must update Thesis first.

1. Using FTP, navigate to the /wp-content/themes/thesis_185/lib/classes/ folder on your server.

2. Edit the comments.php file in the classes folder at line 187, instead of

$wp_query->comments_by_type = &separate_comments($wp_query->comments);
	$_comments = $wp_query->comments_by_type['comment'];

you now write

$wp_query->comments_by_type = separate_comments($wp_query->comments);
	$_comments = &$wp_query->comments_by_type['comment'];

The only change is moving the “&” to the $_comments-variable really but that seems to cause the 500 internal server errors.

Once you’ve followed these steps, check to see if your comments are now being displayed correctly.

Cheers!

I don’t have thesis,don’t see it in my themes file, but now even when I upload updates for my plugins I again lose everything and have to reload my older back up 3.9.1 version

Ok after reading a whole bunch of forums there was one consensus that seems to work for me.
I disabled all plugins and then loaded 4.0 via ftp and it works.Now how do I know what plugins to reload that will be compatible with 4.0

WordPress 4.0
theme: Thesis 1.8.5

leanderbraunschweig’s fix worked. Save me from changing themes on four websites tonight – THANKS!

After re installing my plugins is looks like it was the “Pinterest “Pin It” Button Lite” that was the problem.
I tried deleting and reinstalling hoping that the new one was compatible but no luck so no pinterest for a while.

FIXED!

I just upgraded to Thesis 1.8.5, put the fix in place mentioned by leanderbraunschweig (above) and it NOW WORKS. The upgrade from 1.6 to 1.8.5 was seamless, I didn’t lose any of my theme customization (just make sure you copy your /custom/ folder inside the theme)

It was definitely an issue with earlier versions of Thesis and WP 4.0. (we were running Thesis 1.6 and running into the 500 Server Error problems after upgrading to WP 4.0)

Thank you everyone, especially leanderbraunschweig. This is why I love the wordpress community: post a problem, get answers, problem solved the next day.

How do you upgrade from Thesis 1.8.2?