I figured my error out at least (sorry to necro this but i really thought we had the same issue)
In the console on my page i had this error:
As far as I can tell now this was caused by a gravityforms form being on the same page - the two conflict with one another. I was simply using it as a reference to build the same form in bricksforge. Once I removed the gravityform the console error went away and my conditionals started working.
While I’m here, and since this is not in the documentation or stated completely clearly in any forum posts either, here is how to make a checkbox conditionally display other form fields:
Copy the “Custom ID” of your Checkbox Wrapper (First item in the General tab)
Select the field you want to conditionally show
Select the “Conditions” tab in the lefthand menu
Click “Add Item”
Choose “Form Field” in the Condition select box
Paste the “Custom ID” into the next field
From here it’ll start getting custom to your site, but here’s a couple of working examples:
For a checkbox wrapper that contains multiple fields:
Choose “Contains” and paste in the checkbox value in the field below that