ATI 5970 -horizontal line when in fullscreen crossfire

Hi, i have been having a problem with ffxiv in fullscreen from day one, ive tried every possible driver for the card, did it properly with driver sweep etc.

When i play off one gpu in windowed mode the horizontal blur line goes away.
As soon as i put it to fullscreen and use second gpu the blurred horizontal line comes back.

The card works perfectly for other pc games in windowed or fullscreen, i am currently playing crysis 2 at max settings 60 fps no problems at all. So im wondering if other 5970 or ati users are having a similar problem ?

Thanks for the help

System is:
I7 930
6 gigs ram
ATI 5970 gpu
Haf 932 case with v8 cooler etc.

I have seen the "horizontal line" with a 4850, 460 and 6970. This is the only reason I run in windowed mode.

I noticed this line when i have Ambient Occlusion Enabled, it almost looks like a shadow correct? it's not so much a dual GPU issue as it is an ATI thing, my wife's 6870 has the same thing, over time i learned to ignore it, i hope it gets fixed sooner or later.

Just disable Ambient Occlusion if it bothers you :)

Edit: I'm also running 5970's

Its the refresh line on the monitor. Windowed mode stops it.

No its not a shadow its more like the graphice for a thin line are blurred, the colors are all the same etc it alomost looks like the graphics in the horizontal line stay with what ever pixels are ther for a minute before it goes into the graphics its supposed to display. It only happens when i move the character. If i stand still the lines arent ther, and its not a constant line it shows up for a second than dissapears .. 10 secods later it comes back and than dissapears etc.

And ambient occlusion i have turned off.

Thought something was wrong with my card, I get it all the time. I'm using a 5850.

i get this also in windows mode. Blur line blinking across my the middle of my screen. sometimes in other places. Normally happens when you move from left to right while looking around. I have an older ATI card. think its the 4800..

I have a 5970 and i have the same issue in FS mode. Its like a transparent thin line that appears as you move your char. i have tried to force Vsync through the cat driver to no avail. Window mode @ 1080p my frame rates jump from 40-60. I hope SE takes care of this.

yes jovy and swev those both sound identical to the problem im having, it only happens in fullscreen for me though, in windowed mode when i on one card it goes away, thats odd that it would happen on the 4800, are you just running the one 4800? no second card?
Ive also tried forcing vsync etc. The only thing i havent tried that i saw posted somewhere else was trying a different monitor, i saw another guy having same problem as us and it turned out monitor was the problem.

Also xaiomaomi Is ther a way to get rid of it if its the refresh line on the monitor?