ACS will not save my conditional expressions. I created a condition using an expression if met removes the structure. However, it will not save.

ACS will not save my conditional expressions. I have created a newsletter email that each structure (article + image) has various dynamic conditions that will decide whether to display that structure based on profile data. For profiles that will not see a specific article/image (structure), I want to remove the extra spaces in the email. I created a condition using an expression if met should remove the structure so there are no extra spaces or placeholders in the final email delivery. However, it will not save. I click accept and save but the conditional express isn't saved properly. I was getting an error that was along the lines of "error with saving your thumbnails". Note, the system runs extremely slow. Why will my conditional expression not save but if I used the out of box simplified conditions it does save? Is this a system, config or user issue? Thank you!