When users can’t update webpages its usually a locked page problem and the default setting is part of the users local profile.  The following links describe the problem and the steps needed to resolve the problem.

http://blogs.adobe.com/contribute/2011/11/launch-contribute-freshly-by-deleting-preferences.html

http://help.adobe.com/en_US/contribute/cs/using/WS5b3ccc516d4fbf351e63e3d1180fba1c28-7fe6.html