I am taking an online course that requires me to log in to a remote Windows server, and I am doing so using **Remmina Remote Desktop Client**. Once I am working on the remote server everything is fine, but if I switch to another application on my own computer, and switch back to Remmina, I can no longer type. The mouse still works to navigate the remote machine, and the keys work as shortcuts for some menu items, but I cannot type in any text areas. Control R seems to be bound to 'grab keyboard' on Remmina (I am not exactly sure what that means...), but pressing it does nothing. Every once in a while, and seemingly at random, I will regain the ability to type, but normally I have to quit Remmina and log in again. I am sure there is a simple solution to this, but I have not been able to find it so far. 

I am using Remmina version 0.9.99.1, and Ubuntu 14.04. Thank you!