There is a random issue when importing graphic files into Dru while running on Mac OS Lion.
Installing Java for Mac OS X Lion will fix the issue.
Before Mac OS X Lion 10.7 Apple shipped the OS with Java installed by default.
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.