David,
The SQL warning message that was popping up when you tried to post or reply to a topic was basically saying that the allocated space for the forum was full. Or at least that's the standard interpretation of a SQL INSERT failure.
If you fill the hard drive on your PC at home, it's not the fault of the supplier, and you would need to do one or more of the following:
1. Delete a whole load of old stuff
2. Buy a new, bigger disk drive
Since the message numbers have stayed the the same, and the process of buying and adding a new drive takes time, I'm guessing that the techies have increased the amount of table storage space available to the forum.
But eventually this will fill up again, so maybe the techies should be allowed to delete the oldest postings?
Robert