Oh, those are the same beads as before, no change there.
I am now not at all sure the cold and wet did it after all, may just be I wasn't paying attention until then because now that I'm home and they are warm and dry (okay, hot and humid: fucking kansas city again) the set I brought with me sucks just as much as in iceland. Not ALL the sets with that same cordage are dangerously loose. So that's weird also.
Aside: I stuck some grass sticks between the two cords so I could use them. I do like estimating distances to go, and pace counting to see. It helped get me up the mountain. Now I type this I realize I am a smuggler! I got selected for secondary screening specifically for agricultural products, and yup, the grass blades are still in there.
I had tested the beads (and some other types) before, gonna check not just beads but the whole assembly for things like tension as well: just tossed both kevlar and nylon examples into the deep freeze and will check in a day or so once totally cold soaked. Thermal says it's -9° F in there so that should be pretty good.
And then what for the top end? Laying in the sun in 90° wx doesn't seem as much a stress test as laying in the sun in 120°, but I am not going to Death Valley or MENA anytime soon (ever).