Try checking the permissions of the field that you're having problems with and see if your profile has permission to read it. Skuid respects all permissions set-up in your org, so if your profile isn't allowed to read that field then that might be why the snippet is returning blank.
Can you give a little more context about what your snippet does, or if it's short can you post it? Check your Chrome developer console to see if there are any errors caused in the snippet that may be causing the result to be blank. Once you have the console open look at the console tab, and then run your snippet and see if any errors come up.