Just got off the phone with Dell support. They couldn't figure it out either, we created a new VLAN 60 and it came up fine and worked exactly as expected.  Maybe it's a bug in the 3.3.3.3 Firmware.
I just created a new VLAN 51 on my 6224 core switch. I've assigned it an IP Address, configured routing, assigned it to multiple trunks, and I've assigned an access port to it as well. This is the 8th VLAN i'm setting up, haven't had any issues with the others. Here is what I see when I do show ip interface vlan 51 PHX_Core_Switch#show ip interface vlan 51 Routing Interface Status....................... DownPrimary IP Address............................. 10.200.51.1/255.255.255.0Routing Mode................................... EnableAdministrative Mode............................ EnableForward Net Directed Broadcasts................ DisableProxy ARP...................................... EnableLocal Proxy ARP................................ DisableActive State................................... InactiveMAC Address.................................... 5C26.0AF9.9E8CEncapsulation Type............................. EthernetIP MTU......................................... 1500Bandwidth...................................... 10000 kbpsDestination Unreachables....................... EnabledICMP Redirects................................. Enabled  Why is this interface down?! Help?! I'm going nuts over here!  
Powerconnect 6224 VLAN Down?