Hi. Nothing's wrong w/ the queries. I tried them, and they worked for me.
I doubt this'll help, but you can try this alternate answer I used when I did the course:
set item = 'Hamburger'
set price = 1.00
where item='Popcorn' or item='Candy';
I can't see why you suddenly run into a problem on 2.14, but I can only guess it's a browser, etc. issue.
Check out this other post where I go through some standard trouble-shooting.
As this is happening to you a ways into the course, my best guess is that you should clear your cache and local storage, etc. as described in the linked-to post (it's for Chrome) and/or use another browser (either FF or Chrome).
Provide the info. asked-for in the linked-to post, as that may help me or others diagnosing your issue, and if you do figure things out, then please post w/ what you did.