Hi! I understand you're having trouble with playback on the DMSS app and that it's also crashing. Let's work through this together to get it sorted.

To start, could you tell me a bit more about your setup? For example:
- Is the playback problem happening with live streams, recorded videos, or both?
- When does the app crash occur—when starting playback, during playback, or at other times?
- Have you noticed any error messages?
- Are you using the latest DMSS app version and firmware on your NVR or DVR device?

Meanwhile, here are some common steps to try that often help with playback and crashing issues on DMSS:

1. Update your app and device firmware: Make sure both the DMSS app on your Windows device and the NVR/DVR system firmware are running the latest versions. Updates often fix bugs related to playback and stability.

2. Clear the app cache or reinstall the DMSS app: On Windows, you can uninstall the app, then download and reinstall it fresh to clear any corrupted files causing crashes or playback errors.

3. Check your network connection: Stable and fast internet is essential for playback. Try switching between Wi-Fi and wired Ethernet or resetting your router to improve connection.

4. Verify device login credentials and permissions: Incorrect login info or permission issues on the NVR/DVR can cause playback failure and app crashes.

5. Try playback on a different device or via web interface: This helps check if the problem is specific to your Windows device or the NVR/DVR system.

Could you please try these and let me know if anything changes or if more issues pop up? If you’ve already tried some of these, just tell me what you’ve done so I can guide you to the next steps.

Are you comfortable doing these checks, or would you like me to assist you step-by-step?