Unable to access external drive connected to Mac Pro running Mountain Lion

When I initially connect, it is accessable and I am able to back up to it.  But after a few weeks, it no longer allows changes.  It is still mounted, and I can see the directories on it, but can no longer write to it.  I was told by the folks at G-drive that this is a known problem with Mountain Lion.  I really need my drive to stay available....I notice that there is an update to 10.8.4, but before taking my FM Pro Server offline, I'd like to know if the update will fix the problem.
Thanks.

I don't know if it's the same problem, but in the last few weeks we have had that happen on two machines running Snow Leopard and one running Lion 10.7.5.  In our case, it always involves Time Machine, and the FW external FW drive becomes read-only for no apparent reason and despite the fact that Command+I reveals the user "can read and write" to the drive.  Running Apple's disk utility to Repair Disk a few times usually fixes it.
It's just infuriating. Ever since Leopard came out with Time Machine I had had that intrusive, obnoxious utility permanently disabled. I enabled it in Lion, and I've disabled it again.

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