I have this problem too, attaching a 600 KB file, using the ***attachment button*** at the bottom.
The interface of Evolution gets gray, and the computer unresponsive.
Leaving the computer alone for some time restores the responsiveness (only tried this once).
===> Using the menu this problem does not occur.
I am using a fully updated (November 6, 2009) Karmic, with the standard theme.
I have this problem too, attaching a 600 KB file, using the ***attachment button*** at the bottom.
The interface of Evolution gets gray, and the computer unresponsive.
Leaving the computer alone for some time restores the responsiveness (only tried this once).
===> Using the menu this problem does not occur.
I am using a fully updated (November 6, 2009) Karmic, with the standard theme.
Jaap Woldringh