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There were a couple of weird things that I saw. First, when you double clicked the duplicate the Timeline didn't echo the name. When you went back, it did. I suspect that you're having graphics drivers issues. I'd close all your comp windows and then open them up again. I'd also re-boot and empty caches.
It would help us if we knew what kind of system you were running and if your AE is up to date?
Thanks for your reply. I'm on a macbook pro retina, OSX 10.8.2, 2.6GHz Intel Core i7, 16GB 1600MHz DDR3.
I'm bang up to date with all my CS6 apps.
I think I'm just going to reinstall AE CS6, I'm on a deadline and its driving me loopy having to copy and paste layers into new comps etc.
If anyone has any more ideas before I do this I'd be very very grateful.
Thanks once again.
I'm also on a MBPR... Never seen this.
I think I my have got to the bottom of the problem.
I spent an hour with Adobe tech support on chat. I realised that it only seemed to affect one comp. Then in the troublesome comp, I deleted a layer with Video copilots Element 3D on it. I then went ahead and duplicated that comp about 50 times without any problem.
I will get in contact with Video Copilot support and see what they recommend.
the Adobe rep then went onto say he had seen this with Video copilot Optical flares.
I wish he had mentioned that at the beginning of our chat : )