I'm running an i5, gtx 960 video card, 16 gb of ram definately not low end
250gb ssd drive.
I agree this one will be hard to pinpoint as it could be file based, i've used one version of a backglass and nothing, then use a different download and then it works. On demolition man, had to uncheck hide backglass in the game manager before it appeared.
I'm willing to test and help you solve this Tom, let us know what you need as this one part adds hours to configuration of one table when it should take about 15- 20 mins total to get a table going.