WDM 5.5 Updates and WebUI

We had a Dell engineer come in and set-up our WDM server and at the time he said WebUI doesn't work properly or the default URL when installed is incorrect or something. We was meant to send me the fix but I forgot to get his details and not had anything from him. So question is how do I fix WDM 5.5 WebUI so that it works? Or what is the correct URL?

At the moment I go to: -

wdm01/.../indexf.html

But this just gives me a blue title bar saying "Dell Wyse Device Manager", a search box below and the rest of the screen is all white, no information.

Also the Wyse Device Manager site says WebUI is in Preview, so sure that explains why it doesn't work properly, but when is there going to be an update to WDM 5.5 so that this works?

Thank-you,

Anthony