So I've installed Mono; it's 2.10 and it works fine with X11/Quartz or whatever the new name is haha. I have already used dashboard and converted sims 3 pack files over. When I open sim3pe I'm unable to click "new" or it crashes. Everything else works fairly well for the most part. I've click and dragged stuff into S3PE and it works fine but I've recently come across some converted packages (the bulk of my DC) and I can't seem to drag them into the program for whatever reason and the only way for me to import it but every single time I click it it just crashes.

What version of s3pe?

Drag and drop has never work, it is not a feature of the tool, even in Windows. Opening a package via the File menu don't work? Not just some random package you downloaded over the Internet, try on a game .package file that we know the game can open when it last ran. Make sure to back it up first, though; unless you've already setup your project workspace with spare game .package(s).

Thanks, I actually figured it out. Not sure how but dragging and dropping did put them in but it was causing problems, I went to the sim3pe download source and downloaded a previous version of sim3pe and it now works fine. Just posting incase anyone else has the same problems I had.