Client not visible on screen (but visible in taskbar) just for a character on an account...

Hi all.
I have this curious problem: when I log on one of the characters on one of my three accounts the client just disappears and remains visible on the taskbar, but I cannot actually see it on screen.
The character is actually in game since I can see it on screen with chars from my other accounts (I can launch macros with Razor for the "invisible" account and they work normally, even the UO Positioning system opens up correctly).

I tried to:
- launch UO without razor and the problem is still there
- enter on another char of the same account and everything works normally
- create another char on the same account and everything works normally
- have several beers but even this didn't help :'(

Any suggestions on how to fix this ?

Thanks in advance !

Ok I just saw the troubleshooting sticky and solved the problem (yes, and now I feel a bit stupid ).

Sorry for the dumb post