Timeline view fails to show correctly, mini viewer overlaid on film strip and tracks. When first moving from slide view list to Timeline view, (screen shot 2015 11 25), using F4 or toggle chevron mini viewer is removed, (screen shot 2015.10,16) Toggling F4 doesn't return file browser or mini viewer. The top half of the full screen view seems deleted whilst the double headed arrow used to resize the lower half is missing completely. This is effecting all projects. This issue arose whilst working with a large number of tracks, filling the screen, I believe I have scrolled down the screen and pressed a key or combination causing the problem ( no idea what) I have uninstalled and reinstalled the latest update, this results, when using the run from download, all works correctly, closing the download and running from the new Icon the issue returns. I'm currently using windows 8.1 but there are no other issues on this machine