Transparent alpha channel in flv not working

Bringing a raw avi file into Premiere Pro 2, I applied a
color key effect to the background to make it transparent. I then
exported it as a flv file using Adobe's Media Encoder. The video
codec was set for On2 VP6 with the "encode alpha channel" box
checked. Importing this flv file into Flash 8 using Progressive
download in the wizard, I placed the flv on layer 2 and a
background image on layer 1. When I play it, the background image
pops up, then the flv, but the background image doesn't show
through the transparent area of the flv. Any suggestions on what
I'm doing wrong?

Did you ever figure out what the fix is for your problem with
transparent video? I'm having the exact same issue and have tried
everything -- still no transparency (although my keying was done in
AE).

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