If you set emboss=true on a button widget, and then transition the buttons alpha in or out, the embossed text doesn’t fade properly.
I’ve filed a bug on the system with a simple test case here:
It seems this was first reported in 2014 in this archived thread:
https://forums.coronalabs.com/topic/48125-embossed-text-ugly-when-fading/
It would be great if this could be fixed. The embossed text looks better then the normal one, but isn’t usable for me due to this issue.