I haven't used blue long enough to know whether this is a new problem, but when I choose Script>Jython>Prompt from the menu system, I get a gnome window with a cursor in it. I can only type a line of text into it - nothing else happens!
uname -a gives: Linux writer 2.6.22-14-rt #1 SMP PREEMPT RT Tue Feb 12 09:57:10 UTC 2008 i686 GNU/Linux
Java version: java-6-sun
blue version: 0.122.0 [2008.03.11]