I think I've run into something that someone else mentioned about not being able to see the smelter and associated buildings for currency. It's not that they are still hidden as ????, it's that you can only see the top edges of the buttons for the first two buildings, and the rest is cut off by the window with no way to scroll down in the buildings list. I sent a bug report with a screenshot attached.
Also have run into problems with offline XP after hitting the 2 million cap. Only had an actual negative bar once, but something with the way it's being calculated after the last patch is off.
sadly firefox (only browser where I do know it) stops flash from doing anything when minimized or in a not active tab.
the only solution I can tell is having it run in a seperate window.
What exactly does the difficulty setting do? After a few times playing through, I've seen the same countries pop up no matter the difficulty. Since your using countries, a lot of the names, especially the longer ones, are instantly obvious and kind of makes the scramble pointless. Might want to consider having everything in lower case instead of capitalizing the first letters.
Difficulty could ramp up a little bit faster, and it seems like you still get hit by red balls even after the "next level" menu comes up and blocks the screen.
Can eat up a lot of time (64 minutes for me to get all 200), takes way too long between each word when it does the time bonus. Has a bug which makes it impossible to lose, and no replay value at all.
You can scroll down in the buildings tab. Just drag it around by holding on a non-button space.