ERROR:

The virtual tour viewer can't get a WebGL context in your browser — either because WebGL isn't supported, is disabled, or is blocked by hardware/driver issues.
Common causes and fixes, roughly in order of likelihood:

1. Hardware acceleration disabled in the browser
   
   • Chrome: chrome://settings → System → enable "Use hardware acceleration when available"
   • Firefox: about:preferences → General → Performance → uncheck "Use recommended performance settings" → enable hardware acceleration
   • Restart the browser after changing this.
2. Check WebGL is actually working
   Go to https://get.webgl.org/ in the same browser. If that fails too, it confirms it's a browser/system issue, not your krpano project. Also check chrome://gpu (Chrome) — look for "WebGL: Hardware accelerated." If it says "disabled" or "software only," that's your problem.
3. Outdated or blocked GPU drivers
   Some browsers blocklist certain GPU drivers known to be buggy. Updating your graphics drivers often fixes this.
4. Browser flags or enterprise policy
   Check chrome://settings/content/all or about:config (Firefox, search webgl.disabled) to make sure WebGL isn't explicitly disabled.