Only in admin zone

Hi,

In admin zone when add a block, or comcode, or upload an image i get evry time this error.

I can press Oke, and everything will be fine. The loading screen, keeps loading but i ca click next to it, and its gone 
Is this a known bug? Or did i kill the system 

I try to upload an image here, but also not wrk anymore ... keeps loading loading loading

See here my screen of my website https://imgur.com/oBjXiqv

Hi,

Sorry for the bug.

This version of sources/preview.php should fix it:
https://raw.githubusercontent.com/ocproducts/composr/master/sources/preview.php

It's the same as the other bug you found with preview.

Best,
Chris

Nice Chris. All working fine now!