I don't know if you got this issue ironed out yet or not, but there's a problem with one of the common files for OOT hair products. Check your library in data\outoftouch\OOT Hairblending 2\ OOT hairblending 2 Hair\ there should be just one file in there, "OOT Hairblending Hair.dsf" if the date is anything *before 2023 (my file is dated 1/5/2023) then it will cause Daz to throw a fatal error or issues with iray not working in the scene or when trying to render. I keep a rar with the newer file handy just in case there are issues with any products I install overwriting it. If you have the older file (I think it's dated 2015 or 2017 if I recall) just replace it with the one from a newer product with the more recent date and see if that helps.
Having said that, I've had issues with the latest public release closing on me a lot more often than the previous release. I've not figured out the problem, I just save my scenes frequently. There's a scene saver utility available, but I haven't tried it.
If you need the file let me know and I'll send it to you, it's not very big.