Hi, all-- Has anyone seen this error, and do you have a way to get around it without re-launching yt? <error> plt.clf() File "/nics/b/home/collins/local_xt5/lib/python2.6/site-packages/matplotlib/pyplot.py", line 336, in clf gcf().clf() File "/nics/b/home/collins/local_xt5/lib/python2.6/site-packages/matplotlib/pyplot.py", line 273, in gcf return figure() File "/nics/b/home/collins/local_xt5/lib/python2.6/site-packages/matplotlib/pyplot.py", line 251, in figure **kwargs) File "/nics/b/home/collins/local_xt5/lib/python2.6/site-packages/matplotlib/backends/backend_tkagg.py", line 90, in new_figure_manager window = Tk.Tk() File "/nics/b/home/collins/local_xt5//lib/python2.6/lib-tk/Tkinter.py", line 1643, in __init__ self.tk = _tkinter.create(screenName, baseName, className, interactive, wantobjects, useTk, sync, use) _tkinter.TclError: no display name and no $DISPLAY environment variable </error> I'm running yt on kraken xt5 through a screen session that I have re-started after logging out and logging back in. This has not happened on other machines I've done this one. I tried setenv DISPLAY 666.666.6.6:0 (with the ip of the beast replaced with something real) but it didn't work. Thanks, d.