Unfortunately, there are quite a few moving parts within Experience Manager (the new name for SiteEdit - The inline editor for SDL Tridion).
Problems like this are often something within the configuration, infrastructure or templating. However, before you begin to embark on an indepth investigation, I'd recommend that you check some of the basics. For example:
- Does your user have the necessary Rights and Permissions to edit the Page and Components within the CMS?
- Are the items that you are hoping to update checked-out by anyone else?
- Are the items in Workflow? (This would prevent them from being editable)
- Does your operating system and browser meet the prerequisites?
- Can you update this content within the normal Content Management Explorer (CME) interface?
- Have you tried using another browser / machine?
- Can other users update the content using Experience Manager (and the CME)?
- Are you getting any errors within the Message Centre?
If the problem still persists, and it's none if these things, then you'll need to trace the Experience Manager communication through the system. These posts should give you (or your technical team) some pointers: