The SDK Control Panel is blank and does not show any options / missing VRCUrlInputField

If your control panel is blank like in the image above, try the following steps:

1. In the Project window, navigate to Assets/VRCSDK/Plugins
2. Select all DLLs, right-click and then press 'Reimport'

This should also fix the issue if your Video Players no longer have a VRCUrlInputField.