My project plays back at the wrong speed!

Open up Mixcraft, click on the File menu and select Preferences.

In the Sound Device preferences, if you are using ASIO mode, try un-checking the option called "Use Device's Preferred Settings." Restart Mixcraft and see if the problem is fixed.

If that doesn't help, check that "Auto Beatmatch" is not selected in Mixcraft's Mix menu.

Also look at the sounds on the Sound tab and see whether they are set to "Use Project Tempo" or "Time Stretch." If you don't want the speed of the sound to change at all, select Time Stretch and set it to 100%.