Error moving "v6 classic mode" to "new 6.1 designer"

Dear all,
I'm triyng to migrate the attached form to the new designer.
A confirmation message says that form has been saved correctly with the new designer, but is not possible to navigate "Views", "Actions" and "Settings" tabs in "Pages" section.
Clicking on "Preview" tab, an error is shown:
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Warning: array_filter() expects parameter 1 to be array, null given in /web/htdocs/www.touretteroma.it/home/libraries/cegcore2/admin/extensions/chronofc/helpers/field.php on line 263

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Any suggestion?
Regards
​[file=12136]CONTACT_FORM_28_Apr_2019_19_05_39.cf6bak[/file]

About tabs view, actions and settings, the issiue is caused by my HTML tags into the label attribute of a checkbox.
Removing HTML from checkbox solve the issue.
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About warning on line 263, it seems a bug related to 2 hidden fields in my form.
Is there a bug concerning hidden fields?
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Regards

Hi tourettorama,
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Please see this post - and note that Max has fixed it for the next release.
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Bob

Hi,
was that already fixed?
I did not have the error message yet. But now the error message is suddenly there:
Warning: array_filter () expects parameter 1 to be array, null given in libraries/cegcore2/admin/extensions/chronofc/helpers/field.php on line 263
It affects all my hidden fields with value data.
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F.

instantly installed today. Everything's OK again. :-)
Thank you for the quick support.

It seems for me that the new 6.1.1 does not save forms correctly: I'm trying to create a new form from scratch, but after saving the form, no field is shown in "view" tabs of the designer.
Please, could you check if you have the same behaviour?
Regards

Yes, it does not save new fields and actions with "Full Save".

Known issue, update coming in a few hours (said on another post)