After switching between pages during a gaming session, I was unable to use the Select Tool. I was able to click on all the other tools and use them fine but when I tried to click on the Select Tool nothing would happen. From that point on I wasn't able to click on any tokes or map pieces on the page / session. I had to Exit the session and then Launch the Campaign again to fix the problem. It ended up happening twice and I was the GM. Running on Mac using Chrome (don't have the version number).