Problem or Known Issue: 

Webforms sometimes won't show up (blank page) when you view them.

Why it happens: 

Webforms won't render if there's an invalid default value for a date or time.

Solution: 

Check your default values and:

  • Make sure date and time default values are valid GNU input (see link in the help text of the default value field). Correct them if they aren't.
  • Remove the default values one-by-one until the form renders. (Note, revisions don't track these changes. Keep a record of changes if you want to go back to the orginal defaults.)
  • If you can't identify the problem, contact [webguys].