I have installed UPFRONT along with Upfront Builder and the child themes of ISSUE and SPIRIT. I have read the documentation and combed through the support forums and cannot find a reference to this issue. When editing a draggable text block and adding an image and updating and saving, all works as planned. When I go into UPFRONT and attempt to edit this, and remove the image and replace the image, the new image when published has the editorial X on the upper right corner and the caption changes the cursor to the text prompt. After that, if I choose UPFRONT, the entire upfront interface fails. This makes any updates impossible.
I have tried deactivating all plugins, clearing the UPFRONT cache, resetting the theme and use different browsers and can reproduce this over and over.
I have granted support access via the WPMUDEV dashboard.