As with other caching plugins, Slickstream needs to be excluded from PageSpeed Ninja's optimization. Here are instructions.
1. Login to WordPress and select Settings from the menu on the left. In the Settings menu, select PageSpeed Ninja.
2. Select the Advanced tab.
4. Look for the Merge embedded scripts section and click the Disable radio button.
5. Scroll back up to the top of the page and hit Save.
Note, you may need to clear your CDN cache to see Slickstream components on your site after making these changes.
If you have any problems or these instructions are in any way unclear, please contact Slickstream directly at firstname.lastname@example.org.