This bProject was created in Cubase 1.x. Whats going on?

No surprise that CB11 crashed on me, but when i try and open the back up to the current project i get the above.
This is a .cpr that CB created after i re booted it, from the latest .bak file. Opening the original .bak file works fine.

CB 11Pro 11.0.4 (not updated yet, shouldn’t need to). Win 10.

Actually scratch that. The .bak file opens fine but Spectralayers has screwed up the file and is showing an empty window where the wav display is.