I’ve been having issues with the latest i1Studio software version 1.5 and 1.5.1. It doesn’t let me successfully “save session” which means I loose my work if I close the app or start a new profile , and that interferes with allowing extended drydown time. Till I hear from X-rite, my solution was to roll back to the 1.1.1 version which is working properly and I know produces good profiles.
Finding the right version can be a little complicated because x-rite spreads their content across several URLs, but these links should work for you.
https://xritephoto.com/i1Studio
https://www.xrite.com/service-support/product-support/calibration-solutions/i1studio
As a side note, this is why typically turn off “auto update” on my software and I don’t install updated unless I have the time to troubleshoot and validate that the software has not changed the behavior of my printing or viewing environment. I’ve been bit too many times by updates messing things up while on deadline projects. This was one of those times, said, what the heck, I’ll update” thinking it would be no big deal, but it turned into a multi-day setback.