Using Button in UMG Uniform Grid causes PIE/Editor to crash

Using an uniform grid to space various buttons within an UMG widget (this widget will be a sub-widget for another “main widget”). However, when any of the buttons are clicked, it causes the editor / PIE to crash. I added an “exit” button that currently works in another widget / layout, and it works fine.

Here are some screenshots (the exit button works fine in another widget w/o uniform grid):


Hello ,

I was unable to reproduce your issue on our end. I have a couple of questions to help me narrow down the issue you are experiencing.

  1. Can you reproduce this issue in a new project?
  2. If so could you provide a detailed list of steps so that I can reproduce your issue on our end?
  3. Could you provide a screenshot of the load level custom event?


Here are the screenshots, I’ll check a new project:

Level Blueprint (Collapsed Nodes):

Add UMG Macro:

Finally, the Begin Play Event:

(New comment for organization purposes)

I checked a “normal” button within the uniform grid, and it did not crash the editor. The “modular” buttons are, however. One other thing to note, is that when the PIE window crashes, it does something weird with the mouse. Left button allows you to click on objects within the project, but not move them. The Right mouse button does not move through a graph, but instead comes up with the “wrap with” menu; almost like it’s registering that your hovering over a variable. I’ll include screenshots of the way I have the buttons setup.

(Step 1: Button Background):

The Buttons are made of 2 parts. The first is the “background”, which has a A Button (no functionality), with Text as a child (that’s why I had to use a button, image cannot have a child). These are wrapped with a size box, which in turn, is wrapped with a canvas panel. There are 2 variants, but both are the same, just one is square, one is rectangular (as you can see in the first screenshots). Both are set to hit test invisible.

Step 2: The Button

The next step, is to take the above, and to turn it into the button that has functionality. Pretty basic, it has a normal button with the the widget from above as a child. The normal button has an opacity of 0 so it cannot be seen, with the child as hit test invisible. The button has click events.

Step 3: The Uniform Grid Widget

This is actually supposed to be a child widget for another menu, however, iterate and test, right? After Step 2 from above, the next step was to have a these buttons placed in a uniform grid panel. At this point, the game started crashing.

Here are the screenshots:

Just to follow up.

While this particular issue isn’t “fixed” per se, I decided to make a bit more sane approach and use an event dispatcher to capture clicks and got rid of the “nested” buttons, which reduced the amount of widgets I had to create. Anyways, have getting rid of the nested buttons, the grid panels work without crashing the editor.

Hello ,

Could you upload the callstack from your crash?

Sure. I’ll need to duplicate the issue and install the debug symbols I think (right?) I’ll try to get it done tonight or tomorrow