I could add now that we found that this occur with "long string" property and not the XMHTL.
But this is still strange since it worked before with CMS 5 and it seems to be working when I'm logged in as a editor. Can anyone explain this?
edit: I also now found this, which fixed the problem:
We decided to execute a SQL query directly on the database and replaced all long string properties with XHTML properties by changing the fkPageDefinitionID from tblPageDefinitionType table in tblPage.
We've just upgraded to CMS 6 from CMS 5 and are experiencing a very strange problem.
HTML tags (such as <p></p>) are shown on the page when I access it. But if I enter edit mode and login, the text gets rendered properly, even if I press view mode. But when I logout again the HTML tags are visible again.