I have gone back to my original firmware from saved file and everything works as it should with the drive on region 4. [/quote]Thanks. This confirms my theory, that the multimedia software you are using is to blame.
I used that particular rpc1 firmware from liggy because they were 1.06 same as my original.
Having the latest firmware on the drive isn’t a bad idea at all. Instead of the RPC1, you may try the Autoreset patched firmwares (I have only seen 1.0B).