Using Encore CS3 With Leopard

I have recently purchased the Adobe Production Premium package and successfully prepared several Blu-ray and standard definition DVD's using Encore 3. However, whenever I attempt to output any of these DVD's to Flash Video by selecting Build>Output to Flash from within Encore 3, my menus transcode, but when Encore gets to my timeline video, the progress bar goes to about 20% almost instantly and remains there forever. I have tried several different types of video files including short Quicktime movies created in Final Cut Pro as well as other formats in the Encore 3 timeline. The result is always as given above. When this happens, I finally have to Force Quit Encore 3 because selecting cancel on the transcode give me an endlessly spinning beach ball.

I am running Encore 3 (latest updates installed) on an 8-core Mac Pro (Early 2008 model) with 12 GB of RAM and under Leopard 10.5.4 (latest version with all updates installed). I have successfully transcoded to Flash video these timelines that seem to freeze Encore 3 using MPEG SlipStream so I know the files are OK.

Is anyone else having this problem? Is there any solution to the problem? Does output to Flash simply not work under Leopard?

I have posted this problem on both the Adobe Encore User Forum and written to Adobe Tech Support. I have received no response from Adobe or on their Forum.

I would appreciate learning if (1) this is a known issue with Encore CS3 and Leoaprd, i..e that it is not just specific to me; (2) If there is any fix for the problem.

Thanks in advance for responding.

Tom