remote desktop theme locked

It seems my remote desktop running on my test pc in the other room has locked my theme down.

1 - it is running windows 7 ultimate so supports aero over RDP.
2 - this system running same
3 - aero is actually running the windows are transparent.
4 - desktop composition is enabled in remote desktop options and on host system.
5 - it was working fine yesterday and possibly even earlier today.

However when I select my theme it doesnt change the colour of the windows and disable glass effect and I see this in the personalisation window.

"one or more of the themes has been disabled by remote desktop settings"

--edit--

I can select and use all the default aero themes, my theme doesnt work however.

no idea whats wrong, I wonder if theme file is just corrupt as I just manually changed the theme to how the saved one was and is fine.