Hey! Sorry for responding late to your issue.
This could be a issue related to installed third-party antivirus such as Avast, AVG, and Norton are known to interfere with functionality on The Forge, uninstalling those mentioned might fix this issue. There could also be module interference or world size being too large causing a timeout.
However we could assist further if you can join us on Discord and open a ticket there so we can inspect the world in question in more detail.