User does an importprivkey with rescan.
User thinks software is hung because the rescan takes a while.
User kills software and restarts.
Some coin is missing because the rescan never finished.
Perhaps importprivkey w/ rescan should set the scanned height in the wallet to 0 before importing the key?
From other people I've heard complaints that bitcoind always does a rescan on next start if a key was imported. Kind of completely the opposite from this. Strange.
Hm. I've tested and it doesn't rescan on start after importing a key.
Fun example from IRC related to this: 00:18 < master5o1> ugh bitcoin-qt keeps crashing when i try to importprivkey 00:18 < master5o1> =/ 00:18 @gmaxwell master5o1: What do you mean by crashing? 00:18 < master5o1> okay 00:18 < master5o1> i mean freezing 00:18 @gmaxwell ... 00:19 @gmaxwell It's not crashing. 00:19 @gmaxwell It can take on the order of 10 minutes to rescan when you import a key. 00:19 @gmaxwell (depending on how fast your disk is, on a fast ssd its much less) 00:19 < master5o1> oh.