UMG widget cursor ticking - PIE and Standalone inconsistency

I am using a UMG widget as a custom game cursor, set in the Project Settings.

Now, when I play in PIE, I see that it ticks immediately. But when I play in Standalone, it does not tick until a mouse command has been received.

As a result of this, the user cannot see the cursor until they move the mouse, and it would be better if they could!

Hope somebody can suggest what is happening, and how best to resolve this.