can't install plugins, themes or reinstall/up wordpress, get a 404 page instead.

This looks like some sort of an .htaccess issue. Have you added any redirections or something like that recently?

Thank you Hristo. I have not added any redirects. I copied the site to my server for redesign, using the duplicator plugin, and uninstalled several plugins, installed a new theme, and that’s about it.

I noticed in other similar forum entries that .htaccess was involved in those cases, if it is the cause here, how can I check?

I’m checking on my htaccess file on the site installed in the subdirectory and I have a .htaccess file, and a .htaccess.original file.

The original site only has the .htaccess

I just ran a test: A site I have in another subdirectory was working just fine. I updated to WordPress 3.7 (it had not been updated in a few months) and now it too presents the same issues. Does this help?

Exactly the same problem here with me.
Have you solved this?

Did this happen after upgrading to 3.7?

Yup, I wasn’t sure about the cause but after updating a different, fully-functioning site to 3.7, I ran into the same issue.

Have not been able to solve it yet.

Really troublesome since I need to finish some work on that site ASAP.

Same here – ever since updating to 3.7. All my plugins are de-activated. I haven’t seen any solutions yet.

Where are your sites hosted at?

My client’s site is on InMotion Hosting

When I reverted to 3.6.1, all the issues were gone. Did you try that?

No, I haven’t yet. I’d rather wait and see if there is an update or a fix for 3.7, but it’s not clear to me yet whether it’s been acknowledged that there’s an issue.

I’m using InMotion Hosting as well Rachel. I wonder if that’s the main cause?

Ok, got it fixed, or rather, InMotion Tech Support did, my advice is to get in touch with them via tech support chat, Rachel. Wastabik, get in touch with your hosting provider and see if they can help with this as well.

I had tried to revert via dashboard but could not because of the same issue, and did not want to do a manual reversion.

Feedback from InMotion’s Cory P. was this (only posting the most relevant bits):

On Issue
“your account was forcing PHP 5.2 and 3.7 has serious issues on PHP 5.2 “

“That theme may not be optimized for PHP 5.3+ or WP 3.7+ “

On Fix
“If you look in the home directory, there is a .htaccess file that has a line dictating the PHP version in it which I have commented out. “

On whether I should fix it myself should it happen again
“It should be resolved now, but if it does happen, please contact us again. “

Cory P.’s / Inmotion’s support was very quick and spot on, highly recommended!

Can you paste your htaccess here? And also mention the line you commented out?

Not sure which of the site’s .htaccess he changed, I’m guessing it was the core site, (the domain with which the hosting was registered, which houses the other 2 sites presenting the issue). However, I am not sure exactly what he commented out by looking at this, as both lines dealing with php seem to be active, any ideas?

RewriteEngine on
(here was info info regarding other irrelevant)

# BEGIN WordPress
<IfModule mod_rewrite.c>
RewriteEngine On
RewriteBase /
RewriteRule ^index\.php$ – [L]
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule . /index.php [L]
</IfModule>

# END WordPress