XDCAM Browser 1.0 Bugs can you confirm this.
 

Mac Pro 10.6.4 : QuickTime 7.6.6 : Final Cut Studio 3 (2009).

Sony XDCAM EX PMW-EX 1 Firmware 1.11 (Firmware 1.20 not installed since i only use SxS Pro Cards).

Sony XDCAM Browser 1.0 (i have keeped XDCAM Transfer 2.12 installed for now , but the old XDCAM EX Clip Browser is removed).

Symptom is : Playback Button in Preview Screen dont work but all others buttons are working well including the J-K-L typical edit keys.

Playback work when i use Play Option from Preview in the Menu Bar at the top in Mac OS X ( XDCAM Browser , File , Edit , View, Preview, Window, Help).

Also the Clip play faster than real time in the Sony XDCAM Browser but after being copied it play at normal speed in FCP and playback button on the Sony Browser interface dont work at all.

UPDATE HERE : i have update the firmware of my PMW-EX 1 from 1.11 to 1.20 with success BUT the Bug , Still There i have also Update from MAC OS X 10.6.4 to MAC OS X 10.6.5 but the Bug Still There.

So with these Firmwares and MAC OS X upgrades the only option left is Sony XDCAM Browser 1.0 Software have a Bug i will like if any users here can test this and report here (i have send a feedback to Sony also).