I'm using Chrome 38 on Mac OS X Yosemite. When I click a note I've added to an order, the popup showing the note appears as expected.
Then, there are two problems.
The note text is not selectable. It is impossible to select and copy the new shipping address I've added in the note.
Sometimes, the popup won't go away. When I click it, it fades out, but as soon as the fadeout completes, It immediately reappears, blocking a big chunk of the screen. This only happens sometimes, and when it does, I have to refresh the page to make it go away.