What kind of machine is that running on? The charts take forever to render. How many samples are being plotted on your charts?
I know where in the code the "can't find point view" message is displayed, but without being able to reproduce the problem, it is not possible to diagnose. Can you post an export of the view?
Re the ???, i don't see any of those either. I've attached an updated jar file that will provide more information on the issue. Note that your current version of Mango may not work with this version, so make sure you save the old one just in case. You should now see "(99:xx)" before the last "???", where the "xx" is the language it is trying to look up. Post the entire message that you see - everything between the "???" delimiters - back here.
Attachment: download link