The 1.1b version of Greeble is available. This update to fixes a few major issues that crept in with "greebles in separate objects", so if you downloaded version 1.1, make absolutely sure you replace it with version 1.1b.
http://supercoldmilk.com/ac3dplug/greeble.html
The Windows and Linux version are ready --- check back for the Mac version, hope to have that one out soon. Meanwhile, Mac users, do not use the "greebles in separate objects" option until you can get version 1.1b, and you should be fine.