Apple has released Thunderbolt Firmware Update v1.2 to address stability issues with using Target Disk Mode (which makes one Mac appear as a hard drive to another Thunderbolt-connected Mac). The update is for only those Macs with a Thunderbolt port, and it requires OS X 10.8.3 Mountain Lion or later. As always with firmware updates, although you can download it manually, we recommend relying on Software Update or the App Store app to ensure you get the right firmware update for your Thunderbolt-equipped Mac, and be sure not to interrupt the update process. (Free, 1.22 MB)
Keep Markup Tools Active in PDFpen
By default, PDFpen switches back to the Edit tool each time you add text, scribbles or other markup. To keep a tool selected (continuous use mode), double-click it. To exit continuous use mode, click the Select tool or press Command-1. You can also make continuous use mode the default by selecting Keep Tools Selected After Use in PDFpen's Editing preferences.