Hi, I hope by now you have resolved your problem with Export button. I have the same problem and found that it was caused by some redirection of folders done by Citrix. Our resident experts have 'temporarily' removed this redirection for me so the users can export again. I have been told however that I have to fix it so they can switch this redirection on again (I don't know why). I will follow this up but in the meantime this might help you. Of course if you have already sussed this one out, I am keen to learn from you!
Kees