I have created an identical issue report in the Better HUD repo: mccreery/better-hud#89

Describe the bug
Using Flans mod and BetterHUD, certain modded (and vanilla) UI elements become opaque, even on the parts that are supposed to be transparent.

To Reproduce
Steps to reproduce the behaviour:

1. Install Flans Mod and BetterHUD together
2. See that certain UI elements (from either BetterHUD or vanilla) will lose its transparencies unless holding multiple of the same item in the offhand slot. Examples include the Naseua effect, the hunger bar, and the armor bar. certain BetterHUD elements such as Vignette and water drops also will lose any transparency.

Expected behaviour
UI elements will not ose transparency when the two mods are used togather

Screenshots

(yes, this image does have other mods, but I did narrow the issue down to BetterHUD and Flans)

Versions (please complete the following information)

• Forge: 14.23.5.1854
• Flan's Mod: 5.5.2
• Better HUD 1.4.1

Additional context

Log: gist
BetterHUD repo also has a similar bug report: mccreery/better-hud#60

Hi, Better HUD dev here. I have done some debugging and it looks like Flan's mod corrupts GlStateManager so that calls like GlStateManager.enableBlend have no effect because the manager thinks it's already enabled.

I did a quick check from the root of the zip download for this repo:

$ grep -rPo 'GL11.(glDisable|glEnable)' . | wc -l
52

There are 52 cases of OpenGL state (I only checked flags) being modified directly instead of using the manager. This is probably the cause of the issue.

Thanks @mccreery. As you can see, I've replaced a lot of the direct GL11 calls with GlStateManager and the issue seems to be fixed now.