On my profile's activity page in the reputation tab, there is this smaller reputation graph below which is written
select an area by dragging across the lower chart
Using Chrome, this does not work, and never worked (it works in Firefox though). The small graph is just not interactive. This means I cannot zoom to any other region than the one shown below. Are there any browser setting which prevent this from working? I checked it on other SE-sites, with the same result (is it wrong to ask here because it is no Math.SE specific problem?). I have no other problems with the SE-sites.
Update
I noticed right now that this works fine on UserExperience StackExchange! It still fails on many other sites, e.g. WorldBuilder. What is going on? I thought all sites are functioning more or less the same.