I've had this issue on a couple of shows now from 2.7 up to 3.0.1 created files
When running my main song lists, then updating Intensity palettes referenced by the main list it seems that beams parameters jump to their defaults.
On a couple of shows gobo information would be lost while running that list after updating the Intensity palette. On a different show last week the media player parameters would be lost when doing the same
The parameters are still in the list (not permanently lost) but would not assert when continuing through the list.
Starting from the top of the list would fix this. But not practical in a live setting to fix the gobos that had suddenly jumped to open - or the media that had frozen