Certain Mates working in Model Space but not in my Motion Study?

Hi all,

This is my first post to the solidworks forums so please be gentle!

I am currently in the process of making a large animation through a motion study in Solidworks. I have come across an issue where one of the most important (angle) mates work when I modify it in the model space, however, whenever I apply the same change in my motion study it shows the transition on the timeline but not in the model space above. I then attempt to rebuild and it crashes my mates and has No Solution Found. I do the same in the normal model space and everything rebuilds perfectly,

Any suggestions or information that would help me would be greatly appreciated