Known workarounds (0.91, lp:inkscape/0.92.x): a) close and reopen XML Editor in the current session b) check 'Pre-render named icons' in 'Edit > Preferences > System' and relaunch inkscape
Known workarounds (0.91, lp:inkscape/0.92.x):
a) close and reopen XML Editor in the current session
b) check 'Pre-render named icons' in 'Edit > Preferences > System' and relaunch inkscape