Hello, I found some bug with this 2 mods. If "Custom Fonts" in OptiFine options is "ON", Inv. Tweaks doesn't work properly (hotkeys does not work). If u turn it off, Inv. Tweaks work at full capacity. Sorry, if I repeating. Thank u.

I... can't even begin to imagine what OptiFine could be doing with that option to break something totally unrelated to fonts. I'll have to look into it at some point since I don't usually install Optifine, especially with recent FML/Forge fixing the biggest issue with 1.5's performance themselves.

Cannot reproduce with OptiFine_1.5.2_HD_U_D3 and Forge 7.8.0.707, using default or a 32x texture pack with a custom font.