I am struggling with a problem that schematic accumulates multiple SYMBOLDEFs
for the same symbol. It is especially dangerous because I changed pin length of
a symbol at some point, but both versions are still in the .dsn file. As a
result, sometimes pins get disconnected from wires, especially when I copy/paste
schematic to a different file.

Is there a way to clean up?
The menu item "cleanup" does not exists in newer versions.

Thanks.

mike