diablo 3 screen tearing

Hi

came over from dual-boxing.com. been boxing long time.
I recently build a new PC to box diablo 3. Everything went well except when I launch D3 via innerspace. I get this pretty bad screen tearing. It is like a crack scroll rolling upwards when I move. First I thought it was my graphics card. But then I swaped 2,3 other cards. All have the same issue. I tried various options:

disable enable in game vsync, nvidia panel override, isboxer FPS limiter, innerspace FPS limiter

none of the above did anything to fix the issue.

I also tried launching the game directly into full screen mode (not via innerspace). It works fine. So I am thinking it might be an innerspace thing ? Does anyone else have this issue ?

btw graphic cards I tried, GTX 590, GTX 680, GTX Titan . all have tearing issue.

[lax]

If you want to prevent screen tearing, you need to enable v-sync rather than disable it.

There's an option in ISBoxer, in your Character Set that disables V-Sync by default. It does this for performance reasons, because usually people like to have FPS more than they like to have screens not tearing. And V-Sync on multiple monitors may be completely broken (regardless of using Inner Space; google for multiple monitor v-sync). So enabling it while multiboxing may significantly drop your FPS.

In the top left pane in ISBoxer under Character Sets, select yours. Then in the bottom right pane uncheck "Disable Vertical Sync (allowing V-Sync may reduce "tearing" at the cost of FPS)" and Export to Inner Space. Re-launch the game and/or enable V-Sync in the game after

i actually mean "disable enable in game vsync" so i was toggling it around. But it didn't help

But the check box "Disable Verticle Sync (Allowing V-sync may reduce tearing at the cost of FPS)

uncheck this box, no more tearing!

thanks lax as always.