AHA!!!
Thanks to the above posts, I now know what happened to me last night. Somehow, I must have stepped in some water with my left foot (I am righthanded) during the 10 minute practice session prior to league. Knowing I had to hurry, I grabbed a nice new S8 sole out of my bag, cut it to size and slapped it on. No way would it slide properly. I rubbed it on the approach, on the carpet, on the tile and finally got it a tiny bit more slippery. I managed to struggle through the three games, all below average and left wondering what was going on. Now I know, and wish I had purchased a bunch of S8 soles last year.
By the way, one of the Etonic shoes has a three section sole on the sliding foot so one can use any combination of the three sets of soles they give you. Easier than cutting up Dexter soles, but I do not like the fit of the Etonics I tried.
Now what?