blockland.exe? i dual client all the time and that doesn't appear...
I dual client all the time as well; usually you have splite errors when you run more than one of the same blockland.exe and both are reading/writing the cache.db
We need more information because the current info you are giving us is a bit hard to tell what is going on. Right click your Blockland folder and go to it's properties to make sure it isn't read-only.
