The 'loading screen is off-center' issue forced a change to how we handle custom themes, to be more in-line with how we handle most other custom content - use of the resources-override folder. Anything in the themes dir not in the master file list will now be deleted. [including the old off-center event image]

If you have any custom themes that you want to keep, move the folder from \resources\interface\themes\ to \resources-override\interface\themes\

If you have any installers for themes, please update them to install to the resources override folder as well.