Charles
best ways of doing that on Windows because I am getting that error as well
To hard refresh on windows it's CTRL+F5 refresh, or to clear cache it's usually CTRL+SHIFT+DEL and select cache and all time / everything. Either one of those should wipe any cached data you have and ensure you're on the latest version.
The GUI scaling issue is one we will be fixing in the first patch to the apps / web since app launch. We're trying to pack the update full of fixes rather than releasing lots of little ones at a time, due to the approval process and need for everyone to re-download the apps.