What computer operating system is your Premiere Elements 9.0 running on? And, are you working with the 9.0.1 Update?
What is the burn to product that is throwing off this "Property Data Invalid" Encoding Error?
By any chance is it related to Share/Disc/Blu-ray disc as described in the following?
Add On to post 1 .....
If your burn to is other than Blu-ray, do your get the Property Data Invalid message with
a. burn to DVD, DVD-VIDEO on DVD disc or AVCHD on DVD disc
b. just exporting the Timeline content to a file saved to the computer hard drive....if this is the case, what are the details of
your Share/Computer/ what choice and what preset?