The main reason for this release is a Symfony Bug, which causes Sulu to crash completely. We've added these versions as conflict, so that Composer doesn't install them with Sulu.
Sulu 1.5.18 additionally fixes an issue in the testing environment, which was mainly for testing another bundle.
Sulu 1.6.22 contains three more bugfixes:
- Fixed a few attributes passed to the preview request
- Add a timeout for purging the cache, so that there is no loader for a long time if purging is not configured correctly
- Remove a wrongly added attribute to the outputted links in the text editor