I have some face-me component trees with a transparent PNG material, in SKP Pro v.8 I would still get a shadows if the material transparency was 50% (for example).
But in Pro 2015, the shadow disappears unless the material transparency is set to greater than 70%, which makes the trees more opaque than I want.
This happens in Sketchup Pro v2015 on both Windows 7 and Mac OS X 10.10.1.
I confirmed that this also happens in v.2014, but I know these trees cast shadows correctly in Pro v.8.
I've already reported this to Trimble β I'll let you all know what I hear back.
Regards,
Tim.
[Note: I have attached the v8 version, I had to delete one of the trees to get it below the 4MB limit.]