Our QAs succeeded to reproduce the issue. Actually, the problem appears when you try to set master page for already existing template (Actions
menu > Base Template
> Use you own .master file
). So, currently the workaround is to set the required master page when creating the template:
1. Click Create a template
2. Fill the Name
and choose Use template
3. Click Select another Template
4. Click Use you own .master file
5. Select the master page
6. Create the template and go to add content or return to the grid
The bug is logged and will be scheduled for fix for the next release.
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