I just update from 6.x-3.15 to 6.x-3.17 version of webform module, and I have a problem with some fields of the webform with select or others... module.
When "Multiple" and "allow other option" options are checked for a webform field configuration, le field label is correctly displayed, but the choices are not shown to the user. So the user can't choose a value, and a "fied is required" error is displayed when he wants to submitted the form.
When "multiple" option is checked without "allow other option", everything is OK. When "allow other option" option is checked without "multiple" option, everything is OK.
When "multiple", "allow other option" and "listbox" options are selected, the field choices are correctly displayed.