Unlocker is showing x2 as the locking process as it is causing the shell extension to start up when you access your file (see this
for a more complete explanation), and it is that shell extension which is locking the folder. The question is, does this same behaviour happen when you try the same thing in windows explorer? (It should, as that will start any shell extensions too.) And more importantly, does it happen for all files (unlikely) or just certain types (like photos, music, or text)?
If you're using x2 in "replacement mode" just disable it in the options first to test.