# After Upgrade PerformanceGuard Behaves Strangely

> Fix old icons and backend connection errors in the web interface after upgrading PerformanceGuard.

Source: https://docs.capaone.com/performanceguard/troubleshooting/troubleshoot-server/after-upgrade-performanceguard-behaves-strangely/  
Product: PerformanceGuard — a separate CapaSystems product; do not apply this page to any other.

Symptom: After you have upgraded PerformanceGuard to a new version, the PerformanceGuard web interface looks strange (old icons, etc.) and/or you get error messages because the web interface can't connect to the PerformanceGuard Backend and Frontend servers.

## **Possible Causes & Solutions**

This can happen if PerformanceGuard cache and work folders were not cleaned up before you started the new version of PerformanceGuard.

To clean up the folders:

1. Select

   ![](/attachments/performanceguard/a47786f4-3eb9-4131-8664-07cad1ac4bf6.png)

    /**Start**, type services.msc, press ENTER and stop the PerformanceGuard Backend Server, Frontend Server and Web Server services.
2. Go to \[PerformanceGuard installation folder\]\collector\cache\ and delete all files in that folder.
3. Go to \[PerformanceGuard installation folder\]\display\work\ and delete all files in that folder.
4. Delete the log files in the following folders:

   - \[PerformanceGuard installation folder\]\collector\logs\
   - \[PerformanceGuard installation folder\]\display\logs\
   - \[PerformanceGuard installation folder\]\notification\work\
5. Select

   ![](/attachments/performanceguard/a47786f4-3eb9-4131-8664-07cad1ac4bf6.png)

    /**Start**, type services.msc, press ENTER and start the PerformanceGuard Backend Server, Frontend Server and Web Server services again.