There's some weird bug with mine that makes it so when i set it to read and write and then run blockland, after quitting it goes back to read only. that's why I made my own private little mod thing that deletes cache.db every time i quit blockland.
it's helpful.
For windows users, start Blockland with a Batch file containing this:
attrib C:\"Program Files"\Blockland -r /d /s
attrib C:\"Program Files"\Blockland\Add-Ons -r /d /s
attrib C:\"Program Files"\Blockland\Cache.db -r
start C:\"Program Files"\Blockland\Blockland.exe
Replace the directory with your directory.
You could use this solution instead. Probably.