I've not seen that problem, but I'd recommend that you NOT pull the head unless absolutely necessary. You can probably flush the system without such a drastic and costly step (at least $25.00 for a new gasket).
I guess It's possible you have a large air pocket trapped in your block somewhere. Try loosening and removing the temperature sender from the back of the head and be sure that you've got fluid back there.
Be VERY careful you do not twist or kink the sender's ether-filled capillary tube if you try and remove it.
Also be sure you have the correct thermo. There's at least two different temp ranges.
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