[Shotwell] Video thumbnailer running on every startup

[Andrew McCarthy <me andrewmccarthy ie>]

Hello,

I'm having a problem where the video thumbnailer runs on every startup,
which on my collection now takes over ten minutes each time. The log
shows:

L 14196 2019-08-24 14:12:21 [MSG] VideoSupport.vala:397: interpreter state has changed; video thumbnails may 
be out of date

which seems to be the cause.

Any ideas how I can stop this happening?

Ubuntu 18.04, Shotwell 0.28.4-0ubuntu1

Thanks!

Andrew