This bug seems to affect 6.2 Revision 0020 versions of SiteManager. T4 are aware of the bug and will be releasing a new build later in the month.
The problem is that when the LDAP import is run, the HTML Editor (WYSIWYG) for new Users is not being set correctly. The Users therefore cannot modify content with HTML elements. Any new users after an LDAP import will need to have their editor set. T4 are doing a new build with this bug fix included. The fix can be applied yourself everytime an LDAP import is done. You can do this by running a SQL query on your database, or by manually editing each user’s profile and selecting the editor (make sure to click update).
SQL can be used: update users set html_editor=4 where html_editor=0
