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Got the same issue with the impossibility yo use dev_blind and anything else involved with write permission on flash (tried all pkg available) probably due to some mess.
I reinstalled Kmeaw on Kmeaw in recovery mode after no bootup of PS3 nothing lost of course but this was one of the issues. Today after installation of Multiman 1.16.05 or some other miracle I am not able to explain everything went back fine, dev_blind mounted again and push_cert (for example) working...
What I have done so far is make psn area another game area. I am going to try to figure out how to make the package files when installed with installer under there to only show up there and not in game area as well.