I had an issue when adding a manual jomres link to a link on an article. The link was in the following format:
I got the following error:
Content Encoding Error
The page you are trying to view cannot be shown because it uses an invalid or unsupported form of compression.
* Please contact the web site owners to inform them of this problem.
Solution: Disable GZIP Page Compression
How: Go to joomla backend > Global Configuration > Server > GZIP Page Compression = NO
That solved it for me.