Dynamicly loaded module & password error


Hi all
I implemented the webservice etc. and all went fine. Getuser is working propper.
Now I loaded a usercontrol dynamicly via vb code on the same page
dim c as control = loadcontrol("~/desktopmodules/test/test.acsx")
Now I want to use Iweb-webservices from this loaded control.
As a test I moved the getuser and the vbcode to this test.acsx and start running.
But now I get the message "Not authorized to perform this function: Username xxxx."
Debugging further I found the function (in IwebAuthentiaction.vb) IsUserValid returned false because of the string _Password and strEncriptionKey are different
Any light on this will be welcome.