WowAce

What steps will reproduce the problem?
1. Setting healtbar texture to Flat, Gradient, Grid2 Flat, Minimalist, Blizzard Raid Bar, Blizzard Character Skills Bar, Blizzard
2. Taking damage, from falling for example

What is the expected output? What do you see instead?
Expected health bar to have black background but sometimes it's transparent

What Grid2 version and language of WoW are you using?
r731 and EN-GB

Do you have an error log of what happened?
Doesn't give any errors

Please provide any additional information below.
My profile is this http://pastebin.com/KZdfWQu4
Another problems present is same as in ticket 355, I will also include screenshot of this
http://www.wowace.com/addons/grid2/tickets/355-grid2-empty-healthbar-player-at-full-health/