Can you post a link the the survey?
Also please try the default survey and see if this works.
If it does, can you take a screen shot of the survey you set up, there may be some characters in the questions or answers that are causing problems, we try to remove tricky ones but there may be some more.
Also please take a screenshot of the ‘Collected Data’ screen
When you say there are no results in the data field i’m not exactly sure what you mean.
Do you mean that there are fields in the MySQL table but no data?
When you say the CSV file is empty, do you mean completely or do you get the field headings?
Also, what OS , version of PHP, and version of WordPress are you using?
Can I take it you see no visible error messages when you fill in the survey or download the CSV?
Sorry to bombard you with so many questions, I hope we can sort this quickly for you.
Regards
-D