Hello @Jugibur,
Sorry for not confirming this by reply.
Thanks for spotting this one and the detailed report, much appreciated.
I wasn’t able to reproduce the navigator disappearing, but when dragged to any corner of the viewport did experience the loss of interactivity with the editor.
This should be fixed in 1.2.8.
If you still experience this or the vanishing navigator, I’d really appreciate it if you could let me know by replying to this thread.
Cheers,