One user has html Option Greyed out.

We use GW2014R2

I have one user who can read mail in html but cannot create mail in html. HTML for this user is greyed out. In the client settings Compose html is set as the default. In GW admin console, the user settings for that user also has Compose View html set as the default and Allowed Plain text and HTML (default) is also ticked.

If I use GW on her machine html works fine.

I've never seen this before. Stumped.

thanks for listening. :-)