X Theme Options not loading and Cornerston no acces to media center

[Motor1884]

I use X Theme in Version 5.1.1 and tried to Update cornerstone to V2.1.3. With this Version I had problems, my side wasn`t working annymore. My hoster told me it is some conflict with the Plugin Cornerstone. So i tride to downgrad Cornerstone. I copied the version 2.0.6 of Cornerstone from my test/backup-system.
My side is running again, but i have two problems now that are not occuring on my testsystem.

1. X Theme:
   When i Start X and try to go to Options, I get folling error message:
   “A conflict on the front end of your site has prevented the preview from loading.”
2. Cornerstone: I can edit my side, but if i try to change a image i can´t upload an image or the access to media center ist not working. The access to media center throu wordpress dashboard is working well.

On a nother Copy of my Side (2nd testsystem) I tried to upgrade bothe X Theme and Cornerstone to newest version.
On this Installation i had still the same problems.

I cleard all caches in browser and side, i also disabled the caching plugin, nothing helped.

Please help me to get my x theme & cornerstone running again properly.

[Motor1884]

I synced my test-system to the main system. Here i had again problems with the plugin cornerstone and i had to delete and reinstall cornerstone. After this I got my side running again.
I don´t know what the problem is with the plugin cornerstone. Again and again I`m running in problems that my homepage isn´t running anymore if i try to update this plugin to V2.1.3

[paul.r]

Hi,

You also need to update your theme to version 5.2.2. These two(cornerstone and xtheme) should be updated simultaneously to prevent any incompatiblity issues.

Version Compatibility | Themeco Docs

Thanks