Hello guys!
With the help of a community member called Japooka, I have found the cause of a bug some of you have experienced. The bug where the dungeons won't reset and you can't delete or rename your characters.
It appears to be a problem with GameMaker: Studio (which I use to develop Chronicon) and non-ASCII characters in your username. That means that if you have a windows login username that uses letters that aren't in the English language, GameMaker: Studio won't be able to access and delete saved data. This is unfortunately out of my hands at the moment, but I will do what I can to solve this.
See the workarounds provided here: http://steamcommunity.com/app/375480/discussions/0/458605613389351315/
to see what you can do meanwhile.
Again, I'm really sorry about this. Thank you for understanding.