I've tried from both an iPad, and an iPhone to sling Amazon Prime instant video content to the Rasplex (and to Raspbmc).
At the moment only the audio portion of the stream works. I've added my mpeg2 license key (just in case).
I've tried 0.2.2, manual upgrade to 0.3.0, and now apparently an automatic upgrade to 0.3.1
Logs are attached.
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Looks like it might be an issue with the Amazon Instant Video app -- Youtube airplay to the Rasplex works fine.