Block generation issue with v0.22.0

Created by: M5oul
Since v0.22.0, my node couldn't compute valid block:
2016-08-10T12:12:36-04:00 - info: Matched 4 zeros 000055CF4E509A63C432B86C03DF5AC43A3BA0C91786BB230DD409CDABE64DE8 with Nonce = 12048 for block#29582
2016-08-10T12:12:36-04:00 - info: Done: 000055CF4E509A63C432B86C03DF5AC43A3BA0C91786BB230DD409CDABE64DE8 in 93.43s (12048 tests, ~128.95 tests/s)
2016-08-10T12:12:36-04:00 - warn: Proof-of-work self-submission: Block's signature must match
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2016-08-10T12:52:21-04:00 - info: Matched 4 zeros 00005FE1AB41FBEAD81BBA3A62729BF57984E702F3C40EAAF192E755ABFCF611 with Nonce = 261315 for block#29588
2016-08-10T12:52:21-04:00 - info: Done: 00005FE1AB41FBEAD81BBA3A62729BF57984E702F3C40EAAF192E755ABFCF611 in 1880.65s (261315 tests, ~138.95 tests/s)
2016-08-10T12:52:21-04:00 - warn: Proof-of-work self-submission: Block's signature must match
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2016-08-10T13:20:51-04:00 - info: Matched 5 zeros 000007E087CA7D2375D937755824BC47FF92DBDA4D9AF795ECCF06FB659236AD with Nonce = 95960 for block#29592
2016-08-10T13:20:51-04:00 - info: Done: 000007E087CA7D2375D937755824BC47FF92DBDA4D9AF795ECCF06FB659236AD in 743.62s (95960 tests, ~129.04 tests/s)
2016-08-10T13:20:51-04:00 - warn: Proof-of-work self-submission: Block's signature must match
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2016-08-10T13:28:43-04:00 - info: Matched 4 zeros 000012ACA2DA263823BCCDBF90737649388007F1E79599443D28349B17D23D3C with Nonce = 13248 for block#29596
2016-08-10T13:28:43-04:00 - info: Done: 000012ACA2DA263823BCCDBF90737649388007F1E79599443D28349B17D23D3C in 102.72s (13248 tests, ~128.97 tests/s)
2016-08-10T13:28:43-04:00 - warn: Proof-of-work self-submission: Block's signature must match
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2016-08-10T13:52:39-04:00 - info: Matched 5 zeros 000003369B18F7111FF912E8A8D5614251B151AB242FB7FE5CDC11D2252DFA26 with Nonce = 63797 for block#29600
2016-08-10T13:52:39-04:00 - info: Done: 000003369B18F7111FF912E8A8D5614251B151AB242FB7FE5CDC11D2252DFA26 in 494.49s (63797 tests, ~129.01 tests/s)
2016-08-10T13:52:39-04:00 - warn: Proof-of-work self-submission: Block's signature must match
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