Mates have gone weird!

Hi all,

I have a very basic assembley and for some reason one of the parts isnt behaving as it used to when it was created. I would just delete it and start again but it is also part of a motion study and no doubt ill mess something up later.

Basicly this part which is held inplace by various types of mates isnt responding, i deleted all the mates and it is just locked into place and wont move. Is this a common problem?

Thanks,

Andy

SolidworksAssemblies