I don't see "Glass Block.GSM" anywhere in the AC8.1 US library. I vaguely remember that object in the pre AC8.* library. Looks like they have phased it out.
David Larrew, AIA, GDLA, GSRC
Architectural Technology Specialist
a r c h i S O L U T I O N S
WIN7-10/ OSX 10.15.7
AC 5.1-25 USA