Check the administrator settings.
C:\Program Files (x86)\BraveTree\ThinkTanks
Right click on the .exe file and click properties.
It should look like this in order to work.
Took me a while to figure it out as well. It took me 3 weeks to figure out how to get this stupid 8.1 working well enough to use. I used Vista and ME. neither were as bad as this stupid thing. It's still pretty unstable.
Install Classic shell and completely hide all access to the stupid charms bar. I also installed Aero Glass from
http://www.glass8.eu and presto you can see the windows again. I also went through and uninstalled everyone of the pre-installed apps. Not a one of them is work the memory space on my 1TB drive.