WotLK Broken party Frames

Hi guys,

Everytime the group i'm in is turned into a raid group, my party frames (party 1-2-3-4) disappear.

I've tried to log on a fresh new wow folder with everything deleted except DATA. (which came from an old backup i had with no bugs)
which means, no addon(besides the default blizzard ones), no WTF, etc.... And it didnt work :(

The worst part is that it's happening to only 1 of my characters. So its not a global bug.

I even try the character unstuck (who knows?) but didnt work :(

At this point i think it is not a bug from my side, which bothers me even more.... what can i do to fix it? any ideas?

I'm play on blackrock/wotlk