Don't show user roles after migration

Hi Team,

It's a little bit out of your scope, but maybe you can help me.
That would be great.

We migrate the Wordpress MU website to another server and everything is working fine except 1 thing:
- The user roles doesn't show up anymore

See this image:
=> http://screencast.com/t/FAC1dpVp

Do you know why?

Thank you in advance for your help!
Stijn