My impression overall is that, although very stable, this release needs a bit of refinement. Thx for letting us know 3. Good point 6. It's in the ReadMe and talked about in other threads here 2. Then all your new documents will default to UK English.
Proxy icon is ONLY draggable when the window represents the file on disk exactly.
This means you can drag the proxy icon unless you make changes to the document and haven't saved. These are Apple's rules if you read the Proxy Icon info. We suspect Media Player components as others have been reporting. Supplemental books from 3rd parties are coming out soon. Use online help if not already.