I hope this isn't old news. I use 2.6 on Windows and Linux and on both
versions (as I recall) some menus get errors.

For example: I "menu" (from Morphic as well as from MVC) Open... File...
and open a file. It appears in a window, that has got a large menu, so
it says "more..." at the end. When I select that I get "Error: sobscript
is out of bounds: 17".

It is a general error that can be reproduced, so I think this should
provide you with enough information if you're willing to fix it.

It also happens with some other menu's but I can't recall which.

Greets,

Stefan