I can confirm that reverting to 2.0.2.4 (previous version from May) solves my SLI issue - right away the miner starts mining with both my cards, hash rate is back to double.
I have also had problems with the miner freezing the computer since 2.0.2.5 - I will let the thing mine overnight and see if this issue is also gone since reverting to 2.0.2.4
I run the miner also on two other rigs, both of which are only using 1 card each - and these two rigs has no issues with 2.0.2.5, so I will be running 2.0.2.5 for single card and 2.0.2.4 for SLI for now.
Hopefully it's something they will resolve in the next version

Thanks for your feedback, much appreciated!
I have a miner with 6 non-SLI cards. It works fine with NH.2.5. I think the issue is only with SLI setups.
Thanks for pointing it out and let's hope in a quick resolution!