Hmm.. Pin 4 is actually not connected by default... so that must default to low. I think you're right on 12v making it unhappy. I'll try 5v.
Something that might interest you.. I tried lowering my supply voltage from 12.. 11.. 10.. 9. 8.7.6.5! The lcd runs all the way down to 5v without any apparent change in function. I haven't checked the specs on this, so please kids.. Don't try this at home.

(I'm still using 12v as just to be safe) but its interesting that the screen seems happy with whatever you give it.. (probably by design since its intended for a battery powered device)
Also, Mark. I'm so happy with the package you sent me.

. These LCDs are PERFECT.
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