I tested this with 18.3.0 and 18.6.0 using df19.1
The registry key never gets saved when the ComDoPropExchange gets called. There fore the restore of the layout does not find the registry key to call the exchange

Anyone has any idea why? The DF version of the control (which is 18.3.0) does not experience this issue; I checked the sub-class for it and it is almost a copy of one another.

Thank you,