Opening a G2 file in G3 made all kinds of classes be invisible. The classes are in fact still there but not visible on the left.
Also: is there a way to get rid of the incompatible-triangle or red line above the glyph? The file I opened consists of different masters with “incompatible” outlines. No interpolation and no Instan… excuse me — Exports in between the masters are intended. I don’t see a reason to mark the inconsistency of outlines and I would rather not see the sign of error when there’s none.