As a side-effect of moving the glass repo into a directory within the rt-closed repo, the jfx-clean-sdk target was no longer run for glass (all other targets were correctly propagated but this one was missed).

The net effect of this, as reported by Lisa Selle and David Hill, is that the following sequence of operations run from the top level repo will use the old cached version of the glass-mat.jar and mat.dll files:

ant
rm -r artifacts
ant