Anyone who uses both Sft and Acid Search will probably have run into problems with duplicated menus etc. As of yet, there doesn't appear to be any official fix for the problem, but I have been able to workaround the problem using the following steps:
- Uninstall both Saft and Acid Search.
- Delete the com.apple.safari.plist file (Saft stores some preferences there).
- Install Saft, delete all search engine shortcuts.
- Install Acid Search.