I have suddenly started seing the same error as dan_mason described in other post, that is, I cannot open/edit/create Python snippet nodes anymore. Scripts are working fine, it is just that nodes cannot be opened. I have quickly went after template links in Preferences->KNIME->Python scripting and by checking the default links found that server at idisk-srv1.mpi-cbg.de is down. I found the link below instead:
It should be pointing to the same file at github and thus I added it to the preferences. I have added the same github link to R-scripting preferences and still see the error when trying to work with Python snippet nodes:
Error while creating node dialog for 'Python Snippet': R-templates must start with a line with the scheme # name: blabla