What is a DP4? The discussion is hard to follow for someone who doesn't know that!
DP4 is Developer Preview #4, and given the date of the thread, I'd say the issue may be moot since ML is now out.
Yup, thanks maflynn. DP refers to "Developer Preview", as an ADC member, during OS X releases we are given "Developer Previews" (i.e. "beta's") for testing our OS X applications and/or bug reporting to Apple engineers.
Before 10.7 "Lion", OS X beta's were released to us on a weekly or bi-weekly schedule (there was never any rhyme or reason, they came as the engineers developed). With each beta we had to burn them to a DVD and install a fresh copy of OS X. I suppose this was to ensure everyone had a fresh install and allowed "all things to be equal" between developers for reporting bugs and testing app's.
When OS X 10.7 "Lion" was released, Apple Developer Community membership dropped from hundreds of dollars for entry level to a flat annual $99 membership, exactly as iOS membership. It used to cost hundreds of dollars to be an OS X developer, however this came with perks such as discounts on hardware, WWDC tickets, etc. I believe Apple wanted to bring OS X into the same ball park as iOS; entice more consumers to develop with a lower price tag, perhaps even those not interested in developing but merely wanting the newest OS, which even if they never reported bugs, error logs were sent to Apple during use. So it was a "win/win" for everyone; Apple released less beta's as it seems 4 "Developer Previews" are the "standard" now for OS X (with small updates released via the App Store between DP's), the lower price tag enticed more people to join thus creating more OS X developers which lead to more cash in the OS X App Store as well as more bug reporting, and more money for Apple in the end.
So that is it in a nutshell
I thought about AppleEvent myself. Could it be that? (AppleEvents may be prevented by sandbox).
Hmmm, no idea. During the 10.8 Developer Preview releases, many major changes occurred between the 3rd and 4th release. Most notably was sudden/more "Sandbox" integration. As a means of keeping third party applications out of native OS X apps and processes (as a developer you probably know this know so my apologies for repeating it
. Apple seems to be focusing on more security in OS X, and "sandboxing" applications allows the user to have more control over what applications have access to what personal data/app's. During development, a few third party applications such as "MenuTab Pro" for Facebook suddenly caused Finder issues, etc as it attempted to access area's in OS X it no longer could. It became a guessing game involving "Console" and error logs to figure out what app's were throwing a wrench into the machine. Apple had mentioned "sandboxing" to us, but I suppose it wasn't in enough detail as it caught many of us off-guard around DP4.
Now that the public release is out, many third party developers have already addressed this issue with updates.
Wow, sorry for the long response. Hope it helps a little