SanJose319, you appear to have made a new assembly, have you remade any of the parts?
If you do post your files someone may be able to figure out if there is anything that you had done differently that's causing any of the problems.
For the initial question the reason Adaptivity was greyed out in your Assembly1 was that the scissor_spring-1.ipt was already adaptive in the scissors1.iam assembly.
As for the Drive constraint problem, I only get that error when I'm in an assembly where the spring is not adaptive - in the scissors1.iam it works fine, and if I create a new assembly and copy over the parts with their constraints, then clear the adaptivity in the old assembly and make it adaptive in the new assembly then it drives okay, but I get that exact same error if I try to drive the constraint in the assembly where it is not adaptive.
Please post your files so we can determine what you might have introduced into this otherwise working assembly that is suddenly creating these problems. Thank you.