Don't purchase the 3d glasses until you're prompted via a quest! (Oswald quest line)

When I first logged in today, I purchased all the items from Scrooge that I didn't own yet, including a pair of 3d glasses. Once I started Oswald's quest line, one of the action items was to buy the glasses from Scrooge, and now I seem to be stuck. I've rebought them 3 times from the catalog, but I still can't progress the quest.

So don't buy them yet if you haven't started his quest line! Learn from my mistakes!