When something misbehaves and there's no obvious error, the fastest diagnosis is a conflict test: switch to a default theme, turn off every other plugin, and bring things back one at a time until the problem returns.
Back up your site before you start (or run the test on a staging copy).
The elimination procedure #
- Rule out the theme. Under Appearance → Themes, activate a default WordPress theme such as Twenty Twenty-Five. Test. If the problem is gone, it lives in your theme — restore the theme, confirm the problem returns, and take the details to the theme's developer.
- Rule out other plugins. On the Plugins screen, select everything except Coupon Creator and choose Deactivate from the Bulk actions menu. Clear your browser and any site/server cache, then test again.
- Reintroduce one at a time. If the problem disappeared, reactivate plugins one by one, testing after each. The activation that brings the problem back identifies the conflict.
- Report it. Check the conflicting plugin's support resources or its WordPress.org forum — and let us know too; known conflicts get documented and often fixed.
Interpreting what you find #
- Broken admin controls (tabs, pickers, uploaders) are usually JavaScript collisions — confirm with Troubleshooting JavaScript Errors.
- Print view 404s are usually rewrite-rule interference — see Troubleshooting 404 Errors.
- If the problem survives a default theme with all other plugins off, capture your System Info and contact support.
