In FileMaker 13 when using Custom menus, I have been finding that copy and paste is failing. If I switch back to FileMaker standard menus, then it works.
First time I noticed this was using the current version of SeedCode's SQL Explorer. It worked perfectly in 12, but failed in 13. Since noticing this in that file, I have found the same issue in my own solutions.
The menu items are not grayed out, however I find that when I try to paste, nothing comes across.
Is anyone else having this issue? If so I'll report it as a bug.