Compatibility Issue with sh404SEF Error Page Handling

Unfortunately, I still don't have an answer for you on this. We did some initial testing when you originally created the post, but couldn't find another way to read/set the variables that didn't introduce other problems. The method we use also works as intended with core-Joomla SEF and other routers, and we have many users with sh404SEF working as well.

I'm not sure what the specific cause of the problem on your site is, or if other users with sh404SEF simply aren't using the 404 feature (unlikely, since we're using it on this site, but with an older version of sh404SEF). I still think this is something we won't be able to fix on our end without causing other problems though, which means we won't be able to make that change if so.

Thanks,
Alex

I'm glad you found a solution that works for you and I'm sorry we couldn't find something that worked for sh404SEF and didn't cause other unexpected errors. We will continue to investigate. We're also very excited about the new router that will be implemented in Joomla 3.7. That should make Joomla's generated URLs much better and reduce duplicated content, removing some of the use of sh404SEF.

Thanks,
Alex