On holidays from work at the moment so thought I'd try and install the OS 10.5.6 Update.
Seems that there are conflicts with the Decklink drivers as every time I try and install them the system hangs on rebooting. Starting up in safe mode solves the problem and uninstalling the drivers fixes the problem permanently.
We're seeing the same issue here in QA and are working on a fix right now that will be released in a dot update of our drivers. For other customers, I would not recommend updating to OS X 10.5.6 until such a fix is issued.
Kristian is right, we are looking into a proper solution to this as quickly as possible. But if you are one of those people that updated to 10.5.6 and are stuck (i.e. you cannot go back) then I have a work around for you. It is quick and even better, it doesn't require that you take your computer apart to do it. Just follow these steps below.
1> Boot your computer in safe mode. To do this reboot the computer, as soon as you hear the chime press and hold the SHIFT key. Continue to hold the SHIFT key until you see the gear under the apple, then you may release the SHIFT key.
2> Once the computer has booted into safe mode browse to Macintosh HD> Library> Application Support> Decklink.
3> Find the Decklink Startup file (for multibridge users as well). MOVE this file to the desktop (don't just copy it, it needs to not be in that folder).
4> Reboot your computer normally.
5> Once your computer is back up and running please copy this DecklinkStartup file back into the folder you took it out of (your not done yet, so read on).
6> Now go to Apple -> System Preferences -> Decklink and set the video desktop setting to "Last Played Frame", then close the preferences.
7> Reboot your computer and it should boot normally and all of your previously saved control panel settings should be loaded. Please do not use Video Desktop mode's black setting until we can fix this properly.
This should get you up and running. Of course we recommend waiting to do this update until after we have a proper fix for this issue, but again, if you are stuck, this should help you out.
Of course, for anyone that needs more help then this, I encourage you to contact your local office by phone so we can help you out more personally.
We have corrected this issue in a new driver build. Please use driver 6.8.4 if you have not already updated. If you have already updated, you can use the above work around to get your system up and running again, then update to 6.8.4.