I read another post, suggested that this could be due to the cache being corrupted? Going to delete the cache, let it rebuild, and see if it happens again. You guys might want to give that a shot as well.
According to various sources, it's a bug resulting from a typo in the coad, a corrupted cache, or a bug due to bombing certain vehicles with certain aircraft in the area. No acknowledgement from HTC on any of those posts however. Can't do anything by try rebuilding the cache, so I guess that's what I'll do.