Sometimes thinkorswim seems like it's running poorly, or is having issues. It may be that it updated itself. How do I know if thinkorswim did an update?
Dave F from the trading room pointed out a nifty little trick to get the details on an update as TOS is starting. He let us know that if you click the "p' in the "installing updates" message, you'll get a flyout with details on what it's updating. You have to be quick to see it, unless it's taking a longer than usual amount of time - which might be the case if it's actually updating itself.
If you'd prefer to get the official update news, you can visit tlc.thinkorswim.com and you'll find a button for "Releases". Clicking that will show you when the latest releases occurred, and more importantly, what was changed.