I am using Minecraft version 1.7.10 and Forge version 10.13.0.1208.
Downloaded and installed forge without a problem, however it did not create a "mods" folder so I created one. After placing several mods in that folder (one at a time) I would start minecraft and click the mods button and nothing is there except for the three that came with forge. I've tried numerous mods and double checked their version compatibility. Not sure if I screwed up somewhere. Everything else works fine, no crashes or anything, just no mods. If you require more information I would be glad to help.