Have you reported this to WGT Customer Service? Often, a video has been corrupted for some reason or another, which can cause havoc with Flash based players! This is also beyond wgt's control, as the videos are uploaded by an outside advertiser, but wgt cannot fix the problem, unless they are made aware of it! Best to pass the info along to the Customer Service folks at wgt... I've personally found that they do their very best to resolve these issues, but please too give them a few days to track the source problem down!
Phil aka., Coyote