We released Patch 5 today to fix a film viewer and Track IR issue that we didn't want to put off until the next version is released.
Version 2.27 Patch 5 Changes
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Changed how the game calculates head motion rates for Track IR users.
Fixed a bug in the film viewer that broke the time slider.
If the mission editor cannot find a resource file on the primary path, it will automatically select a secondary folder path of the same name and in the same folder where your mission file was opened.