I just upgraded django tree which recently merged in the unicode support. This immediately broke django templates for venus. Here is what you need to change in planet/shell/dj.py to account for new django changes:

43c43,46
< f.write(t.render(context)) --- > ss = t.render(context)
> if isinstance(ss,unicode):
> ss=ss.encode('utf-8')
> f.write(ss)

This is probably due to render returning unicode strings which need to be converted to byte-streams.

Update: I found out that my changes broke it for people using older version of django. I have updated the patch above to account for that.