Occasionally, we’ve seen a situation where, after installing fastProject, it appears to work until the user mouses-over any of the fastProject buttons in the ribbon then Microsoft Project unexpectedly crashes without warning (the Toolbar - or QAT - is fine). The problem is caused by having an out-of-date version of Microsoft Project, i.e. one that does not have the latest Service Packs.
If you experience this problem, we suggest you perform an Office and Windows update. This will ensure all Office applications and the supporting Windows OS is brought up to date.