There’s and issue with Mac OS X 10.7 Lion and Dru 1.0.2.
Dru version 1.0.2 is not fully compatible with Mac OS X Lion.
Several graphical issues.
Dru 1.0.2 can be used on Mac OS 10.7 lion despite the issues above.
Some or all of issue above will no longer be valid once Dru 1.0.3 is released from the Mac App Store.
Dru 1.0.3 or greater will be compatibility with 10.7 Lion.