Hi @RichardHowe,
I'm sorry that you're experiencing this. The Create and Update buttons should be working, even with data symbolized by a subtype.
Are there any error messages on the form?
Are there any hidden fields in your forms?
One change that was made to forms with the last update is the ability to use a check box to ensure the form preserves values in hidden fields. By enabling this option, the values in hidden fields will be preserved even when the fields are hidden due to conditional visibility. This can be useful to ensure that the form remains complete and that the Create and Update buttons are not disabled.
If this does not resolve your issue, please contact our support team to create a new case. Providing your dataset would help us investigate the issue.