We were at Point 7.2sp2 and pointcentral 7.2 with no prompting for saves. 

Upgraded to Point 7.4sp1 and left pointcentral at 7.2.  No prompt for saving files even if no changes were made.

Just upgraded to pointcentral 7.3sp1 and this is when the save message prompt started.  It appears that the save request is to the poinccentral local workstation file cache based on some info I found about "deleting the file cache" on the Calyx website.  I backed my upgrade out until I contact Calyx for a better idea of whats going on.