I didn't find anyone having this issue here it is: Yesterday I updated SCII with patch 1.5 on my mac (currently running OSX 10.6.8). After updating yesterday it played fine. Today I restarted my mac, clicked on Starcraft and the downloader came up like normal saying "play," now every time I hit the play button it immediately says "an error occurred starting Starcraft II. Please try again."
I tried many times, restarting computer and such and it still doesn't work. I don't know what's going on since it worked before and nothing changed.
Thanks a lot.