Here is the response I got from hosting company.
I have tried three different browsers and each of them had completely strange results.
A) Outdated Mozilla was getting reload loop after entering the last password.
B) Up-to-date Chrome, allowed me to edit the page, adding content without any issues, but I was unable to find the “Save” button.
C) Up-to-date Opera, which threw frequently https://drive.google.com/file/d/0B7ydnETlo8P_RWVzdUtJdExpT3M/view?usp=drivesdk
D) An Up-to-date Safari also caused a loop asking constantly for a password.
Now, during my investigation, I was constantly grepping the error log for a mod_sec error with no success.
However, since the support of the xTheme claim that there is a security rule which breaks their Addon, I have completely disabled the mod_sec rules by adding:
Code:
SecFilterEngine Off
SecFilterScanPOST Off
to your .htaccess. In this case, your site will not be protected by the mod_sec rules anymore (as long as those rules are active).
Once the mod_sec has been disabled, I have tried editing the post again, with absolutely the same result.
I have commented the rule in question (as it is poses severe security risk), so you can uncomment it and test at will.
Please get in touch with your theme developer and ask them what rules should we apply to your account, so their Addon works without issues. I am afraid on their support articles, there is no information what changes are required.
Best Regards,
Vasil Lazarov
Senior Technical Support