It occurs everytime on DataAssist Update pages, but DataAssist Insert pages always works ok.
I have also tried the following to correct the issue but does not work:
1. followed the instructions to delete the winfile cache
2. I have also tried to uninstalling/reinstalling the extension.
3. I have rebuilt my dw configuration folder, and reinstalled all extensions.
None of the above have fixed the issue. I still cannot finish building my update.php form. I have read all docs on modifying existing form with CSS Form Builder.