Weird behaviour

Hi! I've upgraded from beta3 to beta4 by running composer update, but in dashboard there is still "0.1.0-beta.3".

Also, I've installed Guardian extension (by Composer), enabled it but there is no new item in sidebar (reenabling do not help).

Also, syntax highlighting was working, but in some point it magically disappeared. There is no syntax highlighting now. I.e. here: http://nastoletni.pl/d/56-prepared-statements-jak-zabezpieczy-si-przed-sql-injection

Maybe the reason of this is cache? How can I clear Flarum's cache?

The Beta tag was erroneously labeled for Beta 4. You have the latest version, no worries.

As for clearing your cache, you can delete the .js and .css files in your assets folder.

Nothing changed. I noticed that in preview syntax highligthing works, but in post - no.

Did you hard refresh the browser page? Ctrl+R or F5?

Of course, I checked this on other browser too.