I have the situation at the moment of when I open a group in gnus to
read the summary pane and the message pane both show in a window to the
right of my group pane. I can read about two messages and then the
debugger shows in the left window, and gnus and emacs lock up such that
I have to kill emacs to regain control. This means that atm, I can't
use gnus for reading my emails.

Can anyone help me get out of this situation please?

Thanks
Sharon.
-- 
A taste of linux = http://www.sharons.org.uk
my git repo = https://bitbucket.org/boudiccas/dots
TGmeds = http://www.tgmeds.org.uk
Debian testing, Fluxbox 1.3.5, emacs 24.3.1