Recycle Bin & Utilities V 15

Hi, I'm running v15 on Windows 7 Home Premium 64 bit.

 

I've recently added an additional user with no Windows admin privileges.  Since then, whenever I run the disc clean-up the recycle bin does not empty. No doubt I've done something stupid but not sure what,  The box to empty the bin is ticked and I really cannot see why it should not empty.

 

Any ideas what I have missed?