Problem with missing background Artwork

[MikeNZ]

Hoping someone can help with my missing background artwork images?

Have been using later versions of GroovyMame for a while now. Now using v0.161
Same problem keeps coming up.
The background Artwork isn't showing up automatically. (I'm sure I never this problem with vanilla mame or older versions of Groovy).

I can select the Background and overlays etc by TABing into the mame menu. No problem.
If I exit out and run the same game again straight away all the artwork is still shown automatically..
But if I run a different game and then go back to the previous one, the artwork is not sowing up again.

I have all the artwork files I want turned on in mame.ini as below. Any ideas why it won't show automatically?

#
# CORE ARTWORK OPTIONS
#
artwork_crop              1
use_backdrops             1
use_overlays              1
use_bezels                1
use_cpanels               0
use_marquees              0