I've found strange behaviour of buttons (layer and hotspots based on type="text" style) with autoalpha="true" in 1.19-pr14
Code
<layer name="btn2"
style="hs_btn"
align="center"
zorder="1"
alpha="1"
autoalpha="true"
html="Layer button"
onover="tween(alpha, 1)"
onout="tween(alpha, 0.5)"
onclick="tween(alpha, 0)"
/>
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Everything is ok while removing onover/onout events. Could you check it?