Here is the work around I found... when you receive a sms that you want to copy then past (ie a phone number or address that doesn't show up.)
-Long Press on the message that has the text in it you want to copy
-then you select the part of the new message you want to copy
-with shift button held down, roll the the scroll-ball over the text you want to copy (this will highlight the text) then, press down the scroll-ball and a menu will appear, allowing you to copy text.
-then to paste, just press down the scroll-ball and the menu will appear and select paste
This is what I found to be my work around for the same issue I had.