The first time I installed Web Displays and MCEF, MCEF kept loading forever. I left it loading for a few days and it wouldn't complete. When I tried to use the screen blocks, the screen was black and wouldn't turn on. I ended up deleting it. I did everything right, though. This time when I downloaded them, MCEF and Web Displays wouldn't even show up on my "Mods" button on the Minecraft splash screen. When I went into a new world and looked through the creative search and Not Enough Items, nothing was there. I am using Windows 8 and Minecraft 1.7.10, Web Displays 0.11, and MCEF 0.6.
Note: I went into the MCEF jar file by converting it to a zip format, and nothing was there.
First time: Downloaded, but nothing worked.
Second time: Mods didn't even register...
If anyone could help me get this working, I would greatly appreciate it!
Same problem with your second time, my forge logs states that the jar file is not registered as a forge mod which it then proceed to inject the jar in my class files. Went into NEI and couldn't find anything related to the mod.