Don't know why it does that as the operation consists of only copying text of the focused cells, but it does. 100% reproducible.

Steps:
- Sample DB
- Select the "documentation" item of the welcome grid
- Mark it.
- Then add it (the marked item) as a child of all 2nd level subs of the "Documentation" item and all 2nd level subs of the "Example" item. (The purpose is to add/create as many parents as possible to the "documentation" item.)
- Select the "documentation" item and copy it. (Just plain copy of the cell.)

IQ freezes for a while. 

With my DB, it can sometimes freeze for minutes and I have to kill the process.

Thanks!