| Missing pages | Google Adsense improvements | Poorly coded html |
| Accessibility problems | Hosting changes | Screen-size problems |
| Backup restoration | Outdated/unsupported code | Script errors |
| Broken links | Page errors | SEO issues |
| Broken menus | Page formatting issues | Server errors |
| Broken plugins | PHP errors | Website navigation issues |
| Browser differences | Poor image quality | Website version changes |
| Database connections | poor website security | WordPress errors |
| Domain changes |
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