In last linux client:
ERROR: CheckProofOfStake() : INFO: check kernel failed on coinstake 2c023d040ad71d6f00f47bc0edd82f3824c5fbfd33ecb4be90448c51331a40d7, hashProof=0000000000000000000000000000000000000000000000000000000000000000
WARNING: ProcessBlock(): check proof-of-stake failed for block c2aa80393dd56b417f450dcf35e7e90368ccb509d00d286e490929e1e456d5e6
received block b58059df55644b4e25e5
ERROR: CheckProofOfStake() : INFO: check kernel failed on coinstake 399ea6dc0dfe2a8880cb84c528336a6610a67ffbfa43c46fcef61821d701cb3f, hashProof=0000000000000000000000000000000000000000000000000000000000000000
WARNING: ProcessBlock(): check proof-of-stake failed for block b58059df55644b4e25e59f8cdf57d6e20bdc32766db5710c883ff12f0b505165
received block 497fa3a9d29c99f3b083
ERROR: CheckProofOfStake() : INFO: check kernel failed on coinstake e556871a194e50f5e63661f8a257f6db4f6ccc688f5ee32f036fab308ee33f2c, hashProof=0000000000000000000000000000000000000000000000000000000000000000
WARNING: ProcessBlock(): check proof-of-stake failed for block 497fa3a9d29c99f3b08328cac69535f63a5db039346f0c4ec5d7813b01c601c7
received block ea56bd24d3bb91fddb0b
It is normal?