Hi,
I applied the upgrade from v.1.6.5, where I didn't notice the issue.
I am quite sure that it is not due directly to cacheManager extension, but maybe on the libs it uses to list dimention or something before.
I also tried to investigate if it can be tied to my custom theme, but I have seen that basic theme present the same issue.
Anyway there is the problem that lists also inactive plugin's dimentions.