I think I forgot to handle a case: When the chainstate is obfuscated. When it happens, a new record is added to database, hitting the assert condition and making the parsing go wrong.

I added the forgotten feature, but I'm not 100% sure it is ok. So far my tests were OK (for some reason, my main testing bitcoins db was clear of any obfuscation). Could you pull the source again from https://github.com/mycroft/chainstate and rebuild it to try it ? It would be really helpful.