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When the first Lion previews came out, we discovered a bug in the Mac OS X Event Manager. The bug was very specific, affecting only certain Mac models with NVIDIA 9400M video chipsets, only on Lion, and only when a third-party video driver (like Air Display’s) was installed. Apple’s fixed the bug to some degree over the course of a few Lion updates, but it still affects three Mac models.
Here’s the current status: IF you’re running Lion AND if you have an NVIDIA 9400M/9600M chipset AND you have a third-party video driver installed, THEN you will not be able to release the mouse button while drag-dropping something.
This only affects these Mac models:
- MacBookPro5,1 (15-inch, Late 2008)
- MacBookPro5,2 (17-inch, Early or Mid 2009)
- MacBookPro5,3 (15-inch, Mid 2009)
Until Air Display 1.6, we intentionally disabled Air Display on these Macs, so that people would not find that drag-and-drop was broken. Of course we tried to clearly describe the hardware requirements in our app description and web site.
Well, it turns out that the drag-drop bug only manifests itself if you haven’t done a Wake From Sleep since your last Log In or Restart. So there’s a workaround: After each Log In or Restart, close your MacBook Pro, wait for it to sleep, and then open it again to wake it. It’s a little bit of a pain, but it’s there as a workaround if you want to use Air Display on one of these Macs.
Given that workaround, we have now enabled Air Display on all Macs on Lion. If you have one of those three MacBook Pro models, you might want to decide whether the sleep/wake workaround is worth the hassle for you before purchasing Air Display. But at least now it’s your choice, and if you already own Air Display, you can continue to use it on Lion.