I've not run into this problem before the most recent update of SL360. I kicked off a new workshop today and participants on the perpetual license of SL3 cannot open workshop files created in SL360. There are NO features in these files that are specific to SL360 and should open in any version back to SL1.
I've been using the same files all year and this is the first time participants can't open workshop files.
Anyone else having this issue?