1. Check Product Settings: Ensure that all products are set up correctly in your system. Check their configurations, including rental status and any other relevant settings. Make sure that products that should appear in planning are not accidentally set to inactive or hidden.
2. Review Version 17 Release Notes: Check the release notes or documentation for version 17 to see if there are any changes related to planning or product visibility. There might be new settings or features that affect how products are displayed.
3. Update Configuration: If there are new settings or options in version 17 related to product visibility in planning, make sure your configuration reflects your desired setup. Adjust any settings as necessary to ensure that all products are visible.
4. Bug Reporting: If you suspect that this issue is a bug introduced in version 17, report it to the software provider's support team. They should be able to investigate the issue and provide a fix or workaround.
5. Temporary Workaround: If you need immediate visibility of all products in planning, you might consider temporarily marking all products as rented (even if they are not) to see if they appear. This can help determine if the issue is related to rental status.
6. Downgrade: If the issue is critical and affecting your operations, you might consider downgrading to the previous version until the issue is resolved in a future update.
7. Customization or Scripting: Depending on the flexibility of your software, you might be able to customize or script a solution to ensure all products are visible in the plan as desired.

Always make sure to back up your data before making any significant changes or updates to your software configuration. This ensures you can revert to a previous state if needed.