I was previously using an unversioned release of Blockly from unpkg. This was recently updated which broke the UI, so I've bundled a static version of the dependency, which has the added benefit of eliminating any asset loading from third party servers.
If you were having issues with the previous release due to Blockly not loading, this one will fix it for you.
Thanks @Sl4vP0weR!
Contributors
Sl4vP0weR