After update there was a conflict with the plugin Really Simple SSL
I have deactivated de plugin right now.
When activated the content of the side bar is under de site en not near de page.
Can I solve this so I can use the plugin?
From the behaviour you’re describing it sounds to me like the SSL configuration is not fully functional when enabled and causes the site (more specifically the browser) to fail to load resources, such as the styles.
Since the theme has nothing to do with URLs or SSL, the issue most likely falls between (the updated?) WordPress and the SSL plugin.