Thats the main gallery login page
Like stated recheck all your cookie stuff
The
vb and photopost login to be the same needs to be
cookie path /
cookie prefix bb
cookie domain .wfcfotobeeld.com
The vblicense number must absolutely must be the same as
vb's in the photopost config settings. This usually begins with like a
VB blah blah and is at the top of the
vb global.php file and all the other php files. That license number is used in the formation of the password cookie and your logins will never be aligned without that
As far as the userid funkiness not putting the
vb userid well thats purely on your
vb side of things meaning there is a problem there.