Using UE5.1.1 and issue still persists.
System: Windows10.0.19043, RTX4000 GPU, Dual monitors over PCoIP (10Zig Teradici hardware connection to workstation)
The Fix for me was making sure Photoshop was closed. No amount of alt/ctrl/shift clicking in Photoshop fixed the alt view modes shortcuts in UE5.
Reproducible for me:
- UE5 open, with project loaded. (No Photoshop open) alt3/4 switches Unlit/lit just fine.
- Start Photoshop, and immediately go back to UE5, and press alt3/4 I get about 1 view mode switch in before something in the Photoshop loading blocks the UE5 shortcut. So, something is loading from Photoshop within the first few seconds which causes the issue.
- I close Photoshop, and immediately the shortcuts work again back in UE5
Hopefully this helps! 