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Rightyho, cracked it. At least on my machine.

The problem is that there's a conflict between the IEEEtran document class and amsthm package - they both define \proof.

This is made difficult to fix by the fact (correct me if I'm wrong on this) that LyX doesn't let the user mess with the stuff it ...

First of all, is it just the theorems you're having trouble with?
i.e. If you create an IEEEtran document with just some text in does it compile?

Once you have a minimum working document then you can add bits that might be problematic until it won't work any more, then post the errors here and we ...

As far as I can tell this is broken, at least on my installation, but I've found a way of working around it using ERT to define commands like \begin{keywords} instead of the unrecognised \begin{IEEEkeywords} that Lyx inserts.

I'm marking the topic as resolved.

Edit: I've unmarked the topic as ...

The answer is D

Not sure if this helps:
http://www.tex.ac.uk/cgi-bin/texfaq2html?label=newlang

Yep, was just about to post saying the same thing:

%WORKS
$\xymatrix{A\ar[dr] & B\\
C & D}$

%DOESN'T WORK
$\begin{array}{cc}
A\ar[dr] & B\\
C & D\end{array}$


If you need more detail check out Help -> Specific Manuals -> XY-pic Manual

It's a nice package, I'll probably be using it to draw some ...

Yikes. That's not the standard behaviour. Can you replicate it in a more minimal table? e.g one with one column and two rows and single letters in each box?

If you can't replicate it, there's something odd going on in your table contents, rewrite it more carefully and if it's still broken post the ...

Can't replicate your problem I'm afraid. Try putting it in an inline equation, right clicking, select "display eqn" and "number whole formula" and try again. If it still doesn't work view the source (View->View Source) and post it here.

This is just the Lyx way. If you must have space below the cursor then a better solution than dead text would be a vertical space:
Insert-> Formatting -> Vertical Space -> Spacing:Custom & Size: 4in
But this will show up when you create your pdf. If you wanted to be sneaky you could put, in evil ...

Try changing the reference style.

• Click on the BibTex generated Bibliography Thing
• Change style to, for example, plain or ieeetran etc.

Does your problem persist?