After update various errors

Hello,

I just updated the motocms template to 3.0.20 and since then im experiencing various errors:

1. footer and header are missing.

The funny thing is that i restarted the browser and sometimes they would appear but while i was working on the template they would disspaer again.

2. Cannot edit menu

Here also sometimes it appears, some times not

3. Sometimes the CKeditor does not work

In as many times as i click on the text area to activate the editor nothing happens (but again not always)

Finally the background of the header and footer on a "check back soon" page i created and published has disappeared from the site www.fitnessexpo.gr

----

Any suggestion? Do i have to do something after the update?