Are you sure you were mining on right chain in 1.1.1.2? The wallet used to fork very easily (it still sometimes forks now, though less so in my limited experience). I am now keeping a full node running in the hope that it helps others stay synced.
I`m mining on wallet from github, at one time mining was stop bcs dev release new version, I doing dumpwallet on old version and then upgrade the wallet, and now after importprivkey in Recieve tab created new addresses but balance is zero, wtf???