I'm finding this problem using both Mac OS9 and Mac OS10. When I go to "Organize/classes" and create a new class, the class does not appear in the window. I can, however, find the class under "object info".
Starting with a new file, this problem does not occur, but with files where I have imported dwgs which already have existing classes, this problem occurs frequently. I also cannot view some of the imported classes on the organize/classes window even though "object info" tells me they exist.
Am I up against some sort of number limit or is there something I'm doing wrong?