Anybody else with issues on the HTML field?

Hello,

I’m running on Version 7.8.2.
I can add an HTML field, even put a default value in and it will show in the Detail View.
But I can’t edit it - there is not textarea or anything.

Tried it on two different installations with two different servers but the same version.
The problem occures with Suite P and Suite R theme.
Anybody with a similar issue?

Thanks,
Chris