It used to work perfectly, but now whenever I play it, multiplayer or not, all the buildings on the right side are invisible and I can't click or select them, so I always have to be sure I'm on the left side. Is there anything I can reinstall to get rid of this problem?
You could try shutting down your computer if you haven't already, or try playing with a different account. I don't know anything you could reinstall though.
I used to have the same problem, then I got a new computer and the problem never occured. I'm not sure what the cause is but is a very common bug that I tried for hours to get rid of with no avail. Guess your stuck playing as the left side, unless you want to pay for a new computer...
I was going to say that as well, although when I accidentally changed my zoom it just moved the whole right side a little bit so it looked like the units were coming out of the middle of the field. Also they had a "in" but their units looked VERY far from the base.
You could always restart, change the browser, make sure flash player is up to date, ect. A new computer shouldn't be the issue unless you have a totally out-of-date dinosaur, or you have a virus/malware.
