Strange permissions/USB key bug

I have just plugged in my USB to transfer a couple of files to it for printing at an inteet cafe. It mounts correctly, I have deleted the files that were on there no problems and I can create new folders and files without issues. However whenever I try and copy a file onto it I get an error message saying the device is Read Only when this clearly isn't the case.

I use Ubuntu Studio but I guess as I have a non-standard installation with Thunar 1.6.3 from Trusty installed in place on 1.6.10 as features which are missing from the latest version are critical to the way I work I guess I will get little help on here. I'm in the process of installing gparted to see if it works after a reformat. Still had anybody come across behaviour like this before?

$ df -t
/dev/sdb1 vfat 7830556 4 7830552 1% /media/dale/Keyring

$ ls -la /media/***/
drwxr-xr-x 2 *** *** 4096 Jun 27 14:16 Keyring

EDIT:
Well that was weird! After formatting with GParted it would only mount with root as owner so I it really was read only from my userspace. It also reverted to a name of an old Live distro I had on there once upon a time (noticed GParted do this a lot in the past, labels from old usage seem to come to the surface.)

Before installing I had done a update/upgrade as it had been a few days.

Restarting the laptop and it froze with the USB inserted, as if it really did think it should have been a bootable USB device (which it was once upon a time.) But removing and restarting and I have mounted and copied files to it successfully.

Can can anybody tell me how to do a full, true format to FAT32 using GParted, or another recommended tool, rather than the quick formatting which leave the data there and I believe may be the source of some of this weirdness?