Hi! I see you're having issues with the MLB app freezing, the picture lagging behind the audio, and it sometimes jumping back to previous innings. Since you've already tried logging off and reinstalling the app, let's dig a bit deeper to get this sorted out.

To help me assist you better:
- Are you experiencing these problems only on your Windows device using WebKit, or do they occur on other devices too?
- How is your internet connection strength and stability during streaming?
- Do you use Wi-Fi or Ethernet?
- Also, do you have the latest Windows updates installed?

Meanwhile, here are some more focused steps you can try on your Windows 10 device:

1. Clear Browser Cache and Cookies: Sometimes cached data can cause playback issues. Go to your browser settings and clear cache and cookies. Then restart the browser and try MLB again.

2. Disable Browser Extensions: If you have any browser extensions enabled, especially those that block ads or control media playback, temporarily disable them and see if that helps.

3. Check Internet Speed and Stability: Streaming video requires a stable, reasonably fast internet connection (at least 5 Mbps). Try running a speed test and if possible, switch to a wired Ethernet connection for better reliability.

4. Update Browser and OS: Ensure your WebKit-based browser and Windows 10 have the latest updates installed, as outdated software can cause incompatibility with streaming services.

5. Try a Different Browser: If issues persist, try streaming MLB on a different browser like Chrome or Edge to rule out browser-specific problems.

6. Force Stop and Reset App Data (If Using an MLB Windows App): Since you mentioned "replacing app", if you're using a dedicated desktop app version, try going to Windows Settings > Apps > MLB app > Advanced Options > Reset.

If these steps don’t resolve the delay and freezing issues, it's possible there might be a syncing problem with MLB servers or streaming service glitches. In that case, it could be worth checking MLB’s official help or status pages for any ongoing outages.

Would you like me to guide you through any of these steps in more detail? And how’s your internet connection in your setup?

Are you satisfied with the direction I provided so far?