Glitch in level 3. When I first started it the "doors opening" sound kept playing. Kept automatic waves on and when I finished the last wave the doors closed to tell me my score but then opened up again on level 3. Kept all my previous points and money and had to play it again except this time I couldn't place towers where towers had been previously. Then wouldn't send out last wave and I had to reload. Otherwise, awesome game.
Here's what Djugan says to do to get it working:
Dec. 12, 2008 Your broswer's cache is a storage system that allows you to quickly load pages that you have recently visited. The issue is: I uploaded a new version that fixed the load screen issue that everyone was having, but people are still experiencing it because they are playing the older version (the version that was stored on their browser's cache). So to make sure you're playing the correct version, clear the cache. Click on Tools, then Options / Internet Options depending on your browser. Then find cache, and click on clear.
It just worked for me, but it could just be that now is one of the times the game is working fine, as I don't always get the blank screen.
I'm also currently having problems loading this game up. And by that I mean, 4 hours ago it was working just fine and now it just loads to a black screen.