EDIT: this issue will be fixed in the next update (no ETA yet).
A couple people emailed support with saves made after discovering the pillars had disappeared. Unfortunately, in this case that was not not helpful to determine how or why it happened.
If you still have your previous saves, from first arriving on the Nameless Isle until before getting to the Lunar Shrine and finding the pillars missing, please zip them and upload to Dropbox or Google drive, etc, then email a link to supportdos2@larian.com. More is probably better, but even a few saves may help narrow down when the problem occurs, especially if multiple people provide some.
Last edited by Raze; 15/11/17 10:01 AM.