Any hiccups from WWDC and nice summer weather are now over, and the OmniGraffle 5.2 beta releases are now back on track.
Beta 6 addresses a number of nagging issues with respect to shared layers and more importantly (to some), has adjusted the sensitivity of multi-touch gestures for resizing, rotating, and zooming for those users with the trackpads to support this.
As always, the beta download page and release notes await.