PHP direct eval problem after 4.07 update

[janaf]

I have a php-direct eval page with some drop-downs and a Submit button on the same page / same code. The page sends POST data to/from itself. It has been up running for a month after help I got here.

Now, after 4.0.7 I have problems

IF I am logged on to the site, I get the following message after hitting the submit button / posting

vBulletin Messege:

Your submission could not be processed because you have logged in since the previous page was loaded.

Please push the back button and reload the previous window.

I have logged on / off / refreshed several times to confirm. IE8 and FF

If I am NOT logged in, I do not get that message but POST data is not read by the code:

PHP Code:

$brand = vB::$vbulletin->input->clean_gpc('r', 'brand', TYPE_STR); 
$nominalsize = vB::$vbulletin->input->clean_gpc('r', 'nominalsize', TYPE_STR); 


The variables ($brand and $nominalsize) remain empty.

A secuity token is generated like this.

PHP Code:

$a.='<input type="hidden" name="securitytoken" value="';
$a.=vb::$vbulletin->userinfo[securitytoken];
$a.='" />'; 


If this is not included, I get a security error message instead.

Any clues?

The page is here:
http://www.41hz.com/forums/content.php?253-TSdb