Years ago I wrote to the staff at Chessbase and expressed my desire to play at their site and asked if their was any way I could do that on my Mac. Instead of a polite and businesslike reply, I received a curt and arrogant one liner informing me that they did not support Apple and had no intention of doing so in the future.
Now that Apple is the largest and, arguably, most successful corporation in the world, the haughty crew at Chessbase has deemed it worthy of their attention apparently. Unfortunately they have done so in a half assed manner. This application is annoyingly opaque and crashes continually. Save your money and buy another database program or any one of the chessengines out there, which all have adequate databases.