Hi.
Version: 4.5.19(DX64) on Windows7 Home
Steps to reproduce:
1. Run 3D-Coat
2. Open any project or not to open anything.
3. Windows -> Popups -> Color Swatches
4. Click dropdown on Color Swatches window, then click "Load..."
5. Click Cancel
6. Wait a few seconds...
7. Crash. See screenshot in attachment.