Hi @seanmcloughlin! Before downgrading, may I ask you to quit Insync then collect the logs.db and out.txt files from ~/.config/Insync? Then, please send it to support@insynchq.com with the link to this Forums post.
You can try to downgrade to that version by going here: New Insync version: 3.7.12. Let me know if you encounter any issues with this build. Thank you!