Mint 14 with MATE: DVD not mounted

[sciguy]

Hello

I have been scratching my head about this as it has happened on two 
machines with two separate installations of the same Mint 14 version 
(the latest stable version), 64-bit.

If I stick in a blank DVD into the DVDROM drive, I immediately get the 
error "Cannot mount DVD: DVD already mounted."

This would tell me that two processes are competing for the DVD. But if 
this were the case, then neither process succeeded in mounting the DVD 
at all. "mount" and "df" show no evidence of the drive being mounted. 
This has been tried with several DVD, and BD devices. Same error, each 
time.

Did anyone else encounter this error, and if so, what was done about 
it?

These are dual-boot machines, and all drives record perfectly under 
Windows 7.

Paul King
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