We have to copy Maple contents in all possible formats to the clipboard, and Maple can generate some extremely large entries in the clipboard when items are copied out of it. We don't want to prevent this in general (since RTF can be a very useful format for pasting to Microsoft products). We allow the user to control whether, and how much, RTF data is sent to the clipboard.

Bring up Tools/Options and on the General tab set the "Enable RTF copy" entry to "Only for small selections". This should prevent very large amounts of data being sent to the clipboard. On the downside it will mean you can't copy large datasets into MS Office products. If the setting was already at "Only for small selections" set it to "Never". This will prevent any copying to MS Office, except for straightforward text. That should prevent Maple from locking up.

David Clayworth Maplesoft GUI Developer