Affects Version/s: 1.3.8
Fix Version/s: None
Environment:Mac OS X 10.6.8
Java SE Runtime Environment 1.6.0_65-b14-462-10M4609
I created a new profile in order to play in an older version of Minecraft and found that I couldn't launch any version from alpha to 1.7.4 (current).
All I did was change the game directory in the profile settings to <default path>/minecraft-alpha and select an older version from the dropdown list.
Alpha - black screen
Beta - blank screen
recent versions - nothing (application icon appears in dock but no window appears)
Additionally, I saw that it downloaded the older versions to <default path>/<default game directory> and that <default path>/minecraft-alpha contained only logs/latest.log and output-client.log.