Hi there! I understand Jigsaw World isn't loading for you on your WebKit browser with Windows 10. Let’s try to get it working smoothly again.

Could you tell me if this issue happens right when you open the app, or does it hang while loading puzzles? Also, have you tried any steps already to fix it, like refreshing or rebooting?

Meanwhile, here are some initial steps you can take:

1. Clear Your Browser Cache: Sometimes old files can cause loading issues. You can clear your WebKit browser cache by going into the browser settings, finding the privacy or history section, and selecting "Clear browsing data" — make sure to clear cached images and files.

2. Refresh the App/Page: Try clicking the refresh button on the app or browser window to reload the content.

3. Try a Different Browser: Even though you’re on WebKit, opening Jigsaw World in an alternative browser like Chrome or Firefox can help us see if it’s browser-specific.

4. Restart Your Computer: This can clear temporary glitches that sometimes block apps from loading.

If after these steps it still doesn’t load, we can try more advanced troubleshooting like checking if cookies are enabled or verifying if your network settings or firewall might be blocking the app.

Let me know how these steps go or if you’d like me to guide you through any of them!

[Based on info from Jigsaw World Facebook support and other related sources][1].