Autofill not working (Linux+Chrome)

[backseat]

Hi

Debian Linux 9.6
Enpass 5.6.9
Chrome Version 70.0.3538.110 (Official Build) (64-bit)
Enpass Password Manager extension for Google Chrome v5.5.3

Keyboard shortcut for autofilling no longer works. Right click and select 'Enpass' does nothing. Enpass is running.

This used to work somewhat intermittently, but some time over the past few months it stopped altogether.

Suggestions?