Brinkster problems

Hi, I get this strange behaviour on Brinkster. After I installed the forums, and logged in as Adminstrator (letmein) and clicked on "Admin", I got the following error message:

Active Server Pages error 'ASP 0126'

The include file 'includes/License.txt' was not found.

I put the file "License.txt" in the includes/ dir, but that didn't change anything. And another thing, when I press "Back" on my browser immediately after this, I get a LogIn-Box from Brinkster sometimes!!! It says "Connecting to Brinkster" and when I press Cancel, I get the following error message:

HTTP Error 401.1 - Unauthorized: Access is denied due to invalid credentials.
Internet Information Services (IIS)

This can happen 6-8 times in a row until I can finally access /forum/default.asp

LOL what's wrong?

Thank you  for your replies. I have noticed that there is sometimes a slightly different error message:

HTTP Error 401.3 - Unauthorized: Access is denied due to an ACL set on the requested resource.
Internet Information Services (IIS)

I have also posted this at Brinkster and someone there too said that it is server related and probably has to do with session / cookies.
So I guess I have to stick with Brinkster on this one, unless anyone else has any other ideas?

Free hosting ATM. They did a server upgrade to IIS 6.0 about a week ago, you think that could be responsible for this mess?