How to fix terminal when scala interpreter causes invisible text

Question

sometimes after exiting the scala interpreter I get back to my bash shell and all text is invisible. Newlines (returns) from input are not displayed. Below is example output. The first line is the result of an invisible pwd command. The second line is the output of an invisible echo command.

At first I thought this was particular to my machine. But now it's happened under Fedora+gnome-terminal and Ubuntu+xterm.

Any ideas on why this is happening or how I can fix it? Presently, I quit the terminal and open a new one.

michael@gilguntu:~$ /home/michael
michael@gilguntu:~$ what is going on?
michael@gilguntu:~$ michael@gilguntu:~$ michael@gilguntu:~$ michael@gilguntu:~$ michael@gilguntu:~$ michael@gilguntu:~$ michael@gilguntu:~$ michael@gilguntu:/$

Answer 1

Just type in "reset". As for why it screws up the terminal... your guess is as good as mine :-)