Yeah, osu for mac OSX isn't that reliable.
poisonmellon wrote:I'm currently using 10.10.1But I've tried a few times.when I succes running OSU,it plays "welcome to OSU "but it just shut down automatically and I don't know why.
I've had to re-download and delete osu multiple times, sometimes not even able to open it in the first place.
Check what programs you may have, like I found if you have Razer Synapse then osu! will keep crashing.
I'm not really able to help unless I know the direct source, so my guess is to wait until osu! is updated (next patch) or try and re-download osu! again.