Q: How to resolve error “Unable to load Master key” on clicking Master Keys tab

A:  “Unable to load Master key, can’t connect to the Master HASP on the Business Studio Server.”

Try to unregister HASP HL COM (HASP HL SDK) and register latest HASP SRM COM.

-> To unregister the HL COM component, type the following command:
regsrv32 /u hasp_com_windows.dll
(HL COM taken from HL SDK 1.3 installation)
-> To register the SRM COM component, enter the following command:
regsvr32 hasp_com_windows.dll

Open Business Studio application again and check.