Cannot Copy Files to Drive/Partition

I'm currently dual-booting Windows 8.1 and openSUSE 12.3. I am preparing to upgrade to openSUSE 13.1 and make it my only OS. I ran into a bit of an issue that has me stumped. Here is the setup I started from:

Drive 1:
Partition 1: Windows
Partitions 2-4: /, /home, swap (ext4 for / and /home)

Drive 2:
Windows data, formatted NTFS, mounted in /home

External Drive (USB):
Backups, formatted NTFS, mounted in /home

I moved my backups onto an old external I had and then went to work on the current one. In Windows I used diskpart to wipe my external drive. I then booted into openSUSE (after removing the entry for the drive in /etc/fstab) and used YaST partitioner to format the drive ext4. Using Dolphin file manager I can copy and paste data from Drive 2 into my /home directory. But when I copy files from Drive 2 and want to move them to the external drive, the paste option is grayed out. Linux detects the drive because it shows up in Dolphin and I can browse to it.

Any ideas why I cannot copy files to that external? Need any more info from me? It's probably something simple I just haven't thought of. Thanks in advance for any help.