I know that Nvidia cards aren't optimal for Cryptonight mining, but I'm finding now that the 1050ti cards I have in my rig now hash about a third slower than they did under the old xmr-stak (they used to be around 300H/s each, and now, neither of them can get much above 200H/s).  

In fact, I have a 750ti in another computer that hashes faster (about 250H/s), even after this change.

EDIT:  For other people who may be having this issue, the default configuration for 1050ti cards has drastically changed in the new version - these cards now default to 8 threads, as opposed to the old default of 36.  Changing the threads will increase the hashrate to the old levels.