One of my colleagues suggested you may want to try out our new alpha release. Details are listed here. It feels like it might be worth a try given what you're experiencing. One of the key differences is that we're switching from peewee to SQLAlchemy as our ORM, which might address some of the database issues you're experiencing as a result. Do let me know if this does/doesn't help!
Could you also check if the error persists across browsers? We mainly want to rule out that this is a Chrome/Firefox/Safari mishap.