> Did you notice that when clicking the Java 3D it automatically loads 
>> whether or not the live 3D checkbox is checked?  I'm not sure whether this 
>> is just me. 
>>
>
> Also, just now noticed a couple weird introspection things:
>
> * Evaluate a jsmol and make it live.  
> * Now change the code in that input cell to something like plot? and tab
> * You should see the jsmol revert to non-live, and sometimes I can't get 
> it to appear at all again (this is not always the case)
>
> Alternately,
>
> * Evaluate a jsmol and make it live.  
> * Now change the code in that input cell to something like plot and then 
> tab (no question mark)
> * The jsmol reverts to non-live, though you can make it live, and the list 
> of options gets covered up by the jsmol.  The only way to get it back is by 
> tabbing again (but be careful, because if the thing you tabbed is also a 
> function name, Sage interprets the second tab to be a request for 
> documentation).
>
>
Aannnd... try

sage: y = var('y')
sage: plot3d(x^2+y^3,(x,-1,1),(y,-1,1),viewer='tachyon')

from the *command line* in an older version and this version.  In Sage 6.2 
I get, as expected, a png file popping up, clearly a Tachyon one, while in 
6.4.rc0 I get a jmol app (unless I messed up switching branches while 
testing #16640, but I don't think so).  The display hook changes are what I 
would target, but I don't really understand that code very well so 
hopefully someone else can try to diagnose it.

Of the three issues
1. Live Java
2. Weird introspection
3. Tachyon not working from command line

I would only deem 3. a blocker, assuming it was introduced at some point 
during this series of betas, because people definitely do use tachyon to 
create super-cool Sage-powered videos.  1. is based on a user intentionally 
asking for Java, and 2. is annoying but an easy workaround is re-evaluating 
the cell or just making a new cell above it (though both should be fixed).

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