I am not at a computer to test it atm... but do the expertise feats still work while casting? I remember that they used to. Yes they do.
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Inactive for a while Is there a hak that keeps it from working? B\c I don't believe you can remain in expertise mode while casting on the server that I play. Just trying to figure out if they are running some kind of hak. You can rescript it so that it deactivates when you cast spells.

-DaMouse There is a switch that is possible to turn off using expertise while casting. CAnt remember further details but it was in a patch after 1.62.

Syrath
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It's SHADOWDANCER, dammit, shadowdancer!!! Improved Expertise was meant for melees. It makes casters and rakashakas overpowered. Depends on where you play...