I have this lower third sequence I have created and am experiencing some black frame at the 1st frame of the animation. I have narrowed the issue down to enabling or disabling the drop shadow on the tracks that require the shadow. No Shadow, no black frame. Shadow enabled, I get a black frame at the 1st frame.

Anyone seen this before?

Edit: In posting the timeline photo, I noticed I was in "32-bit float", switching Vegas to 8-bit and the issue goes away. hmm.

Showing the Black 1st frame in rendered sequence:


Showing the resulting graphic:


Showing the Timeline setup: