Concerning histograms, this is a feature on our list. Stay tuned.
Concerning the problems you are having loading a CSV file, the error message you are seeing isn’t one I would expect. If you could provide a few more details we should be able to get to the bottom of it though:
- What operating system are you running?
- What browser?
- Approximately how big is the CSV file (in lines) and (if you know) how was it created?
- How did you load the CSV? By dragging or by some other means?
If you feel comfortable doing so, could you send the file, so I could try it here.