Inconvenience? That's putting it lightly. We've put off our entire CF11 deployment due to this issue. It's put us behind for at least 6 months.
Might I also add: these are issues I've run into in trying to FIX the terrible looking charts in the first place! So, not only is the backward compatibility of CFChart non-existent in CF11, it's filled with bugs that make it impossible to "fix" without completely recoding the way the charts are implemented.
Bugs (not all were submitted by me):
3800311
3798825
3797316
3756789
3756754
3756738
