Quote from: Alec40Gr on February 26, 2018, 06:41:16 AM

synchronizing from scratch without bootstrap stuck at block #2256008 Sat Jan 20 03:06:01 2018 (win 7 x64 - tried 2 times)

debug.log

2018-02-26 06:36:01 ERROR: GetTransaction : Deserialize or I/O error - non-canonical ReadCompactSize()
2018-02-26 06:36:01 ERROR: CheckProofOfStake() : INFO: read txPrev failed, aa2f8c400739d2cc6576bda8b19088f099bda90a05789a393dd428dbafaa2286
2018-02-26 06:36:01 WARNING: ProcessBlock(): check proof-of-stake failed for block 4bf4fd27021a7130e6397f34b04d051c60cf6b39694f52dfc891b2ffa5c1dec7
2018-02-26 06:36:01 ERROR: ProcessNewBlock : AcceptBlock FAILED

Hi, Alec40Gr.

This means there's data corruption in the blockchain in the disk.
When you say you tried twice, do you mean you tried to sync the chain from zero twice? And did it stop at the same block height in both runs?
There's no way to be sure at this time but my guess would be a corrupted/broken disk as that code (tx disk serialization/deserialization) is pretty solid in other wallets as well. Let's see how it goes for other users too and keep this issue in mind if it pops up again.