I checked the browser of a user where it is having the problem and one that is not having the problem and both of the browsers contain the related fix when I do as you suggested to look at the code. We did not have this issue in Forms 9, only in Forms 10. Any ideas?

Are you embed form by using embed code generated from Forms publish page or use iframe?

We are able to reproduce this issue when use iframe and when the height of iframe is very long and the form is very long and the signature field locate at the bottom of the form.

And here is the workaround you can try:

backup the forms.js file(C:\Program Files\Laserfiche\Laserfiche Forms\Forms\js\form) and modify the file by changing

if(LF.inIframe()&&!isMobileBrowser&&(window.innerHeight>Math.max($('html').height(),$('body').height())||window.innerHeight>window.screen.availHeight))

to

var canGetParent = false;try {var test = window.parent.document;canGetParent = true;}catch (e) {}if (canGetParent && LF.inIframe() && !isMobileBrowser && (window.innerHeight > Math.max($('html').height(), $('body').height()) || window.innerHeight > window.screen.availHeight))

You can search by "isMobileBrowser" to locate this piece of code.

Refresh the page in the browser and check whether the signature dialog can be opened, after apply this fix, the signature dialog will appear at the very top and you need to move the scrollbar up to see it.