Same here, but i have found thread with this bug and it's - prepare - TWO YEARS OLD and its still not fixed :doh:, nobody even said why it happend cause it might be not track bug but some graphic card or driver problem. Anyway there is at least one more place like that on Blackwood.
Ok i have found one more floating barrier on Aston - it is on fast chicane (the other one that Flame posted) + i want to remind about surface bug on one of the U turns.
PS: I think it would be great if whole track bug section was cleared and locked and there would be only 7 topics each one for whole track (for example: Blackwood Bugs, South City Bugs etc.). Anyone who have found bug would post his bug in specific thread and there would be less mess.