If you have performed a clean installation of your system software because of system issues, you may find that moving the missing (third party) items from your previous system folder to your new system folder will recreate the original issue. To avoid this a systematic approach to copying over these missing items will determine which of these items may have caused the issue.

First Steps:

1. Copy any folders in the previous system folder but not in the system folder.
For example, a Claris or Aldus folder.

2. Restart your computer and try to duplicate the issue.
If the issue reappears see FINAL STEPS below.

3. Make a list of the items in one folder within the Previous System folder that are not in the folder of the same name within the System folder.

4. Copy the items on the list from the folder within the Previous System folder to the folder of the same name within the System folder.

5. Restart your computer and try to duplicate the issue.
If the issue reappears move the items on the list from the System folder to the desktop.

6. Move the items you copied to desktop back into the System folder one at a time, restarting your computer and trying to duplicate the issue after copying back each item.
When the issue reappears see FINAL STEPS below.

7. Repeat steps 3 - 7 for each pair of corresponding folders.
In the case of the Extensions and Control Panels folder instead of moving the questionable items to the desktop you can use the Extensions Manager to turn off those items on the list then turn them back on one at a time, restarting your computer and trying to duplicate the issue after turning each item back on.

8. When the issue reappears see FINAL STEPS below.

1. Once you have isolated the faulty item, it should be moved to the Trash.

2. Reinstall the item, with extensions turned off, from original disks to see if it recreates the issue.
If reinstalling the item recreates the issue, you need to move the item to the trash. However if reinstalling it doesn't recreate the issue, you will be able to leave the reinstalled item in your system folder and continue to use it.

3. If reinstalling recreates the issue, check with the vendor to see if there is a update/fix for the item.