Same issue for me here, disabling GPU rendering fixed it. Made an account to give you all some diagnostic info. Also, on a side note, isn't 3 layers of spam blocking a bit excessive?
Application paint.net 4.0 (Final 4.0.5288.36565)
Build Date Tuesday, June 24, 2014
Hardware accelerated rendering (GPU) True
Animations True
Language en-US
OS Windows 8.1 (6.3.9600.0)
.NET Runtime 4.0.30319.34014
Physical Memory 12,175 MB
CPU Intel(R) Core(TM) i7-4700MQ CPU @ 2.40GHz
Architecture x64 (64-bit)
Process Mode 64-bit
Speed ~2394 MHz
Cores / Threads 8
Features DEP, SSE, SSE2, SSE3, SSSE3, SSE4_1, SSE4_2, XSAVE
Video Card NVIDIA GeForce GTX 770M
Dedicated Video RAM 2,986 MB
Dedicated System RAM 0 MB
Shared System RAM 6,087 MB
Vendor ID 0x10DE
Device ID 0x11E0
Subsystem ID 0x10E81462
Revision 161
LUID 0x0000C44C
Flags None
Outputs 1
Video Card NVIDIA GeForce GTX 770M
Dedicated Video RAM 2,986 MB
Dedicated System RAM 0 MB
Shared System RAM 6,087 MB
Vendor ID 0x10DE
Device ID 0x11E0
Subsystem ID 0x10E81462
Revision 161
LUID 0x0000C8D0
Flags None
Outputs 0
Video Card Microsoft Basic Render Driver
Dedicated Video RAM 2,986 MB
Dedicated System RAM 0 MB
Shared System RAM 6,087 MB
Vendor ID 0x1414
Device ID 0x008C
Subsystem ID 0x00000000
Revision 0
LUID 0x0000C843
Flags Software
Outputs 0