I am not sure whether I am raising this issue in the correct spot. I have not found any kind of developer site for Zen Coding plugin in Sublime Text 2.
The issue is, that the Zen Coding Plugin does have some keyboard shortcuts in Windows, that are conflicting with the standard Sublime shortcuts. Namely:
I don't know if this is everything. I have only checked shortcuts with Ctrl+Shift+LETTER, since I had problems with Ctrl+Shift+n in HTML files.