I'm having the same problem: ios 11.2.6, evernote 8.10.1.362115
On some notes, when selected, I get the spinning wheel of death forever, or until I exit and restart.
Removing indentation in the note resolves the problem. To quote the Car Talk guys "BOOOOOOGUS"
I'm also a premium customer, and I've loved Evernote for years, but this has gotta get fixed.