Elevation data issue

When I try to reset the elevation for one of my routes, it seems to happen very slowly, and eventually times out without finishing.  For example, I'm trying to reset the elevation for a 55 mile ride.  After several minutes the "resetting elevation data" box disappears, which would lead me to believe it's done.  However, when I display the elevation graph, it only shows data up to whatever point it was at when it stopped calculating.  Last time I tried it showed about 25 miles worth of data, then the graph ends.

Any ideas?  This could be a problem on my end, but it's happening on 2 computers (work and home) for the last several days.  I'm using Firefox (if it matters).