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Another reason this can occur is due to a constraint conflict in a different area of the model, fix the constraint conflict and the dragging issue will be resolved.
Kind regards
Will
I had this problem too, but found that I had another broken constraint in my assembley,
check your design doctor isn't red and if you have any broken constraints fix suppress or delete them,
not sure if this is what is causing your problem, but thats how i fixed mine
You have responded to a very old thread.
Hopefully in nearly 9 years - the OP has figured out the problem.