Hogstooth7

So I run on a mac and tecknic has run fine for ever. Its been perfect. But about a 2 and a half months ago the pack wouldnt even start. I clicked on the tecknic launcher and it would not pop up. It pissed me of so I re-installed it. Everything seemed perfect untill I tried to load a pack. It was a endless white screen. I got mad and went into the folder. META-INF was not deleted for some reason. I thought that was the problem so i deleted that. Now it looks like it will run fine but then it crashes. So i re-installed it again and now it crashes constantly. I havent played tecknic for about 2 months and am still waiting to see if it is a widespread problem they will fix. Help please.