WPMUDEV dashboard access denied

I am having trouble again installing the WPMUDEV dashboard on a new site http://www.knowledgeculture.com.au. Last night I had trouble installing onto evengallery.com.au. Eventually that installation worked after my hosting provider support guy simply deactivated and reactivated the plugin, and then proceeded to login in to the dashboard with the credentials I gave him.

I wonder if the it's a user problem on my end - but i cannot get the dash to work!
Could I ask one of you guys to login to my WP and see whether you can then login to plugin dashboard from your end?
Thanks, Michelle

PS. Please don't tell me to contact host, I already have :slight_smile: