Having drawing delays in Toonboom Storyboard Pri 2

Hi guys. I’m having trouble with the brush tool in TB SBP 2 (9.1.0). I get this drawing delay while drawing. Have restarted my computer twice. I have a fast computer with a fast video card and Im drawing on a Cintiq 21 UX with an updated driver:

Model Name: Mac Pro
Model Identifier: MacPro3,1
Processor Name: Quad-Core Intel Xeon
Processor Speed: 2.8 GHz
Number Of Processors: 2
Total Number Of Cores: 8
L2 Cache (per processor): 12 MB
Memory: 4 GB
Bus Speed: 1.6 GHz
Boot ROM Version: MP31.006C.B05

ATI Radeon HD 5770:

Chipset Model: ATI Radeon HD 5770
Type: GPU
Bus: PCIe
Slot: Slot-1
PCIe Lane Width: x16
VRAM (Total): 1024 MB
Vendor: ATI (0x1002)
Device ID: 0x68b8
Revision ID: 0x0000
ROM Revision: 113-C0160C-155
EFI Driver Version: 01.00.436