Previous alphas were utterly flaky for me, but a11 has been very solid. The only bug I have seen a few times has been the one where playback hangs at the end of a track, and any fwd or rew just moves to the next/prev track but doesn't play it.

A reboot through hijack sorts the issue out straight away, so no biggie.
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Rory
MkIIa, blue lit buttons, memory upgrade, 1Tb in Subaru Forester STi
MkII, 240Gb in Mark Lord dock
MkII, 80Gb SSD in dock