Refreshing Pro Tools UI when new tracks are created

Occasionally during the execution of a script the PT tools main menu items (File, Edit, View, Track, Clip, etc) become unresponsive which will throw an error. sf.keyboard.press({keys:"left"}); will refresh the main menu and make it responsive again.

From what I understand, the mainWindow cache contains all of the elements in the main window but most importantly it is where all of the track headers are cached (this includes track names, track visibility, track order, etc). The track header contains all of the UI elements in a track (mutes, solo buttons, inserts, track color, output assignments) - pretty much everything in the main window including counters etc.

Because of this whenever tracks are changed (specifically if anything changes or has changed in the track list window) then you need to invalidate the main window using sf.ui.proTools.mainWindow.invalidate() before proceeding in a script. However, if an element besides a track is changed in the main window (the value of an send assignment for example), you should only invalidate the element rather than the whole window. Invalidating the entire main window (or sf.ui.proTools) incurs a performance hit in SF.
If you haven't read it already there's a much more in-depth explanation from Christian here: When to use invalidate() #post-2