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Everything is working... I had NEVER a problem with using Primecoin...
I have mined in pools and now solo, traded a lot (many years), sent to friends - never had even a single problem!

And look at Gridcoin... mehh...

More BS. Today, setting up Primecoin GPU miner is much harder than setting up BOINC. Development is pretty much abandoned and users are left on their own to dig through various, obscure bitcointalk threads.