If Tux Paint is buffering and not loading when you click "OPEN," follow these steps to troubleshoot the issue:

1. Check for Updates: Ensure you are using the latest version of Tux Paint. Navigate to the official Tux Paint website and download the latest version if not.

2. Run as Administrator: Sometimes, running the program with elevated permissions can resolve issues:
- Right-click on the Tux Paint icon.
- Select "Run as Administrator".
- Try to open the application again to see if the problem persists.

3. Adjust Settings:
- Access "Tux Paint Config." This tool is included with Tux Paint.
- Experiment with the "Cursor" setting or any other relevant configurations to see if adjustments help resolve the loading problem - learn more.

4. Check Known Issues: Review any known issues associated with the current version of Tux Paint you're using. For instance, Tux Paint can experience freezing or crashing due to specific bugs. This documentation can provide targeted fixes - learn more.

5. Reset Configurations: If you recently changed settings, consider resetting Tux Paint to its default settings:
- Close Tux Paint.
- Navigate to the configuration files, typically located in your user directory.
- Delete or rename these files to allow Tux Paint to recreate them with default settings.

6. Check for File Corruption: If you're attempting to open a specific drawing file, it may be corrupted:
- Try opening a different drawing or create a new file to check if the issue occurs with all files or just one.

7. Reinstall Tux Paint: If problems persist:
- Uninstall Tux Paint from your system.
- Reinstall it using the latest download from the official site.

8. Seek Support: If none of the above solutions work, consider reaching out to the Tux Paint support community. You can report the issue with detailed information, including the operating system, version of Tux Paint, and a description of the problem. Documentation for troubleshooting and requesting assistance can be found here - learn more.

By following these steps, you should be able to diagnose and potentially resolve the buffering issue you are experiencing with Tux Paint.