Hi Tracy -
Could you possibly be logged into your Mac as a different user? Are the projects on a readonly volume? Else did you recently run any scripts to "fix permissions"? Somehow it appears that all your .xcodeproj files suddenly became "Read only", which means either the file or volume permissions changed or your login changed.
If you know how to read Unix file permissions in Terminal, go into some of your project directories and see what the perms are on the files and the project directory itself.
Otherwise, start this way:
1) Ctrl-click on the locked icon in the Groups & Files tree, and select Reveal in Finder;
2) Ctrl-click on the file's icon in the Finder window, and select Get Info;
3) Expand the Sharing & Permissions panel at the bottom of the Info window;
4) Your login name should be the first line in the table which lists Name and Privilege;
5) If the Privilege setting for your Name is "Read only", locate the Lock icon in the bottom right corner of the panel;
6) Click on the Lock and enter the Admin. password when prompted;
7) The Lock icon should now change to Unlocked;
8) Click on "Read only" to the right of your Name, and select "Read & Write";
9) Click the Lock to close it;
You may need to close and reopen your project first, but after that the lock should be cleared.
Of course these steps will only unlock one file, and we don't know how many files will need to be unlocked, much less how they all came to be locked in the first place. But hopefully, something here will give you a clue that points in the right direction.
\- Ray
