This is a follow-up. I am a noob and had this problem. I read the advice in forum but didn't quite located the correct image directory for chmod. Finally, I did this and I think it is a good method because some very very nice developer put in a feature to help noobs like me stop tripping over myself.
If you are having this problem when uploading pics:
Error occurred during the moving of the uploaded file.
Then login to your site as the admin and get to the administrator's panel. From there, go to the main menu: Components>>Community Builder>>Tools When you invoke this utility, you will be presented with three options. One of them is: "Check Community Builder Database"
Click on this link and CB will run a diagnostic of its databases and data stores (directories). In my case, this diagnostic identified that my images directory was not writable. It told me the full path to the directory. I actually discovered that the directory didn't even exist. I suspect that when I installed CB, the parent directory didn't have write permissions or wasn't sticky for writes and that caused the installer not to create the images dir. Anyway, I created the directory manually and the chmod'd it to 777 and the problem was solved.
I hope this is helpful to someone.