Invalid Action Specified: Is this caused by vBSEO?

I tried solving this problem over at vBulletin: Is there a solution to the "Invalid Action Specified" problem? - vBulletin Community Forum

It appears that my problem is not with vB3.7.x and I've noticed online that those reporting this bug are running the vBSEO product.

Symptom:

1. New to vB3.7, when a Moderator or Admin has been logged in for a period of time and takes a Moderating action (i.e. deletes a thread) he is prompted for a password.
2. System validates password.
3. Error: Invalid Action Specified

The workaround is that the user is now "logged in" to the AdminCP again so it lets the Admin or Mod perform the action the second time around but it is very annoying.

I found one thread on this forum but it seems like I've done everything.

I upgraded to the latest version of vBSEO today. I uploaded the new .htaccess, and I reset the bitfields.

Am I missing something?

what is the "&do=" part of the URL when this fails?

&do=login right before it comes to Invalid Action Specified.

Here is an example of a URL where the vBulletin message is displayed:

HTML Code:

http://www.puritanboard.com/inlinemod.php?t=34934&p=&postids=433480

So, it's passed the &do part with the login and fails when it gets to the action of moderation that I was trying to accomplish.

Same problem

make sure you redirect non www to www [How to] Setup www.yourdomain.com or yourdomain.com (www vs. non-www) - With .htaccess 301 redirects

Already done.

Ditto. Problem remains.

Could you please open a support ticket with a testing account and details on how to reproduce the issue (including example URLs).