Any suggestions on this? I tried letting it sit overnight to see if the "flag file" was ever "generated and parsed," and I tried disabling Avast AV before running. I also tried re-installing 3.7.2 again through Goober's installer. I guess it is not a big deal, really, since I have not run into any issues so far with the nightly build, but all I have played since this error started is FSBlue. I don't know if older mods will play so nice, so it is nice to have a fallback ready.
EDIT: I just tried using today's nightly as well, but when I selected it the launcher just locked up and stopped responding. Even when I close and re-open it, cannot get in to change my .exe. I'll try reinstalling the launcher to see if that helps.
EDIT 2: Disabling AV let the more recent nightly work, but still did nothing for 3.7.2.