[support] Problems Adding New Blocks in 4.6.5

[Jiann-Ming Su]

I'm trying to add new blocks.  I was able to add one and enable it. 
For some reason, that's the only one I've been able to add.  When I
try adding another, and click on "Save block",
the list of available blocks comes back, but the new block isn't
listed.  I'm even given a "The new block has been added" message.  I
didn't have this problem when I was testing 4.5.x.  What am I doing
wrong?

--
Jiann-Ming Su
"I have to decide between two equally frightening options.
 If I wanted to do that, I'd vote." --Duckman
"The system's broke, Hank.  The election baby has peed in
the bath water.  You got to throw 'em both out."  --Dale Gribble