VERIFIED SOLUTION i

Where are the quick access toolbar menu preferences saved in MapInfo Pro

Products affected: MapInfo Pro™
The Quick Access Toolbar menu preferences are stored under C:\Users\[USERID]\AppData\Local\MapInfo\MapInfo\Professional\1700\MapInfoPro.RibbonState.xml
 (i.e. 1700 for MapInfo Pro 17.0)

NOTE: We do NOT encourage you to alter this file; and we will not support any problems that result from a user modifying this file, or any others in that directory.

Also, please check under the PRO tab > Options > Application the Load State on Startup and Save State on Exit should be selected in order for settings to be retained.
UPDATED:  August 22, 2019