onPC 1.5 crashing

It's happening for you on a Windows machine?

For clarity, you're talking about when you resize the entire display, right? Not when you resize for example a preset pool or a 3D window or something like that.

Are you running onPC as a windows administrator?

1. Close onPC
2. Right-click on the Desktop icon
3. Click on Properties
4. Click on the 'Compatibility' tab
5. Enable the checkbox at the bottom that says 'Run this program as a Windows administrator'
6. Press {Apply}

Please post a screenshot of the System-tab and of the Display-tab of the Windows10 inbuilt DirectX Diagnostic Tool:

https://www.windowscentral.com…g-directx-diagnostic-tool