Movie Thumbnails Gone/not Appearing

[carparkthrasher]

Morning, have uploaded a movie this morning along with the usual 100 pixel thumbnail and this has not gone up and none of my previous efforts are showing yet they have done in the past. Is this something I have done wrong? I see othe rmembers having issues as well where there clearly should be a thumbnail but it hasn't made it up all the way.

Thanks

CPT