At the beginning of the launcher it states that my Minecraft can't find SunCertFinder or something like that and it won't let me log in when I put my info. I've been trying to solve this issue for almost a week but I think it's almost time I give up, I've reinstalled Minecraft, Java, Flash Player and have searched everywhere for a solution and can't find one.
I've added a video, pause if you need but if you can help please tell me what I can do!
I have a mac too, but i never had this problem on mine craft, but here are 2 things I think can fix your problem!
1) Maybe your email isn't correct. Example: Linx123.Yolo@gmail.com; Maybe its that period.
2) If its not that period, try this: Use your Minecraft username. If that doesn't then use your Email account but make sure you migrated it to Mojang. The log in.
Sorry if this isn't the best Info, but, I tried.
Just Message Mojang on the Minecraft Forums or make a thread on minecraft forums and maybe they will create a video or solution