I found the issue, turns out it was due to NV generosity in allowing SLI in "windows" to work only on Quattro cards. The game has three options, one is a trap for SLI users. Window, full screen window and full screen. I must have set the game to full screen window during game play somewhere around the time I updated the BIOS. In full screen SLI works. YAY!
ps. I bought two second most overpriced cards ever, I have the full right to bash on it. Second to only Titan Z, that is one masterpiece of ripping off, at least Titan at the time of release and for quite some time afterwards was the best GPU by far, Titan-Z on the other hand was already worse than AMDs card that cost half as much. It still is so good that replacing it doesn't make sense, 980 is not that much faster.
I didn't want to bash your purchase but if we're bashing the GTX Titan....
Personally, the GTX Titan was a joke of a card. It's a shame people actually felt they were getting something worthwhile for that $1000. Even worse for those who bought more than 1. It held up in no type of way, and Nvidia further pissed on the owners of the card with the GTX 780Ti. Then, to throw salt in the wound, it decided to completely ignore Kepler for the last couple of months with driver updates, only optimizing for Maxwell while the GTX Titan struggles against the R9 290 in many games.
It's barely that far ahead of a GTX 780 even.\
Up the resolution and you see how even more of a joke the card was.
But even more annoying isn't that it had poor performance for it's price. It's that people continue to cry about it as if Nvidia ripped them off. As if they didn't get a chance to see the benchmarks. Owners of the card knew full well it was overpriced, yet some still have the audacity to whine about the card's performance, rather than accept that Nvidia didn't release the GTX Titan at $1000 because they felt the performance justified that price tag, but simply because it would be the first to launch at that price tag.
Don't reward people for price gouging the living hell out of you, then whine about it later.
Just my 2 cents though, since we're bashing the GTX Titan...