I'm having very strange issues with validation of a '0' value in either a number field (range set to min = 0, max = 99) or a single line of text field (initial value = 0) when either are required fields. In both cases neither the default value 0 or a typed in 0 are accepted or stored upon submission of the form.
The "real" scenario has the question fields below a section break that has validation on it to show / hide the section based on a drop-down field (i.e. one set of questions shown to people who are attending an event solo versus a different set for those who are attending as part of a group of 2 - 5).
I did a second form test with just the two field types and got the same results.
PHP Version 5.1.6
MySQL Version 5.0.45
WordPress Version 2.9
Gravity Forms Version 1.3.8
For the time being in this particular instance I can turn required / validation off and hope that people are able to read / respond to questions accurately. I hope this is something that one might call an ID.10-T error or me taking crazy pills.