Hi, I have a CC character which I created and modified in Appearance Editor. Now, some weeks later, when I load the file in CC, I am not given access to the Appearance Editor anymore. Ideas? Thank You. 

Possibly also worth noting. 

When exporting your character from CC to IC the textures will be flattened. When importing that character back into CC From IC, you will not be able to edit the cloth or skin etc.. Until you either do what Rampa suggested, or reapply the editable cloth or skin texture over the top.
I would recommend saving all content in CC projects and as CC Cloth/skin/eyes/etc in the appropriate custom section before transferring your content to IC and back to CC. This will allow you to always reapply your editable textures, without having to start again from scratch.

I have a massive amount of custom skin/cloth/eyes/teeth and projects etc.. They do add up, but when i finish working on my projects, and after the project is saved, i will go through and delete all the custom textures that i no longer require to be easily accessible. As they will be permanently saved in the CC project.

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Indeed. There isn't much reason to send a character from iClone to CC. It works much better as a one-way process from CC to iClone. Much faster iterating just sending it one-way as well.