It looks like NMC merged mining stopped to work. Last payment I received was from 2014-03-08. BTC mining and payments still work as expected. Anyone has similar issue?

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I am working on it, haven't forgotten about it, and it will get done.  Also, when I do make the next NMC payout it will include backpay from the last valid payout (Mar 8th I believe off the top of my head) to the next valid payout.  The pool is still mining NMC for you guys and everyone will be paid their NMC.
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Stay tuned.  I'm hoping to have it done today, but no promises.

-wk