Why are my webform conditionals not always working?
As our native language is Belgian Dutch and we use a comma for decimal separator, I added a simple replacement for comma to dot in webform_calculations.js. This resulted initially in a javascript error for empty fields, and meanwhile the code was reproduced in Drupal's default files. Since only one webform has calculated fields only that form was affected when logged on as user. After correction a new file was generated and strange enough only administrator login used it, so all worked fine, while the user logon kept using the faulty file, even after all cache cleaning (Drupal and browser) and rebuilding.Replaced all files with correct code..
Problem solved.