Hi there! I understand you're experiencing a system error while trying to check your appointments on MyUPMC. I’m here to help you resolve this.

Could you please provide a bit more detail about the error? For instance, what message do you see when the error occurs, and at what point in the process does it happen? This information will help me assist you better.

In the meantime, here are a few preliminary steps you can take which might help resolve the issue:

1. Refresh the Page: Sometimes, simply refreshing the webpage can clear up temporary issues.

2. Clear Browser Cache: If refreshing doesn't work, clearing the browser's cache can help. You can do this by going to your browser settings, finding the option for privacy or history, and selecting clear cache.

3. Try a Different Browser: Since you're using WebKit on Windows, you might want to try a different browser like Chrome or Firefox to see if the issue persists.

Let me know what error message you're seeing and how the above steps work for you!