Here is a video demonstrating the problem - Video - Crash report - Skip to 0:57 for screen blinking
OS - Windows 8.1
Forge Version - Forge 12.18.2.2147
Java Version - Java 1.8.0_101 64bit
Mods - ConquestReforged, BetterFoliage, Daflight, Journeymap, Optifine, Pixelcam, Worldedit
Pressing the Render button causes the crash
Oh I am sorry about that, yes the other GUIs work, double clicking a keyframe, the settings menu, etc, all work just fine.
So I had not been able to get an crash log prior because I would close out the application early. This time I just let it keep blinking for about two minutes before it crashed an made a report - Crash Report
I have discovered that optifine is what is causing my crashes. I need optifine for the content I produce however. I tried both the B1 and B2 download options, both cause the blinking. W/O optifine, everything works great even with other mods, any suggestions? I am on 1.11 minecraft now, and I am using the forge you suggested in your download section. [Crash Report]
This is a bug in Optifine and has been fixed with its C6 version. If you're using a Minecraft version prior to 1.12 for which there has been no new Optifine version released, this applies:
HD fonts on some systems are bugged. Try to remove either just the fonts from your resource pack or remove your resource pack as a whole.
To remove the HD fonts from your resource pack do this:
1. Open the resource pack .zip
file
2. Go into assets/minecraft/textures
and remove the font
folder
3. Go into assets/minecraft/mcpatcher
and remove the MCfont
folder
If you're on Windows, there's also a video in case you're not sure how to do the above: https://youtu.be/In-VJrpF5UU