After your message I tried more formats.
The Movie's Are Playing, Right Click, Select Window, Select "Screen Grab To File" Or "Screen Grab For thumbnail"
Formats Used: AVI, MPG, WMV, VOB
All with a black screen using both ways.
Media Center
Install Path: C:\Program Files (x86)\J River\Media Center 19\
Interface Plugins: TiVo Server (not running)
JRMark: never run
Library: 22686 files, 16.2 MB in library, 392 MB in thumbnails
Resources: 26.2 MB memory, 245 handles
Version: 19.0.88.0 Registered
Memory & CPU
CPU features: MMX, SSE2, SSE3, SSSE3, SSE4.1, AVX
Free Physical Memory: 5.7 GB
Total Memory: 7.9 GB
Operating System
Microsoft Windows 7 64-bit
Power
Mode change (disable screensaver, keep monitor on) [expires in 1 minute]
Computer
ACPI x64-based PC (driver 6.1.7600.16385)
Disk drives
Generic- Compact Flash USB Device (driver 6.1.7600.16385)
Generic- MS/MS-Pro USB Device (driver 6.1.7600.16385)
Generic- SD/MMC USB Device (driver 6.1.7600.16385)
Generic- SM/xD-Picture USB Device (driver 6.1.7600.16385)
Hitachi HDS721010CLA630 SATA Disk Device (driver 6.1.7600.16385)
LaCie 4big Quadra USB Device (driver 6.1.7600.16385)
SanDisk Cruzer Glide USB Device (driver 6.1.7600.16385)
SanDisk Cruzer USB Device (driver 6.1.7600.16385)
ST315003 41AS SATA Disk Device (driver 6.1.7600.16385)
Display adapters
NVIDIA GeForce 8400GS (driver 9.18.13.1106)
DVD/CD-ROM drives
hp DVD A DH16ACSH SATA CdRom Device (driver 6.1.7601.17514)
Human Interface Devices
HID-compliant consumer control device (driver 6.1.7600.16385)
HID-compliant device (driver 6.1.7601.18199)
HID-compliant device (driver 6.1.7601.18199)
USB Input Device (driver 6.1.7601.18199)
USB Input Device (driver 6.1.7601.18199)
USB Input Device (driver 6.1.7601.18199)
USB Input Device (driver 6.1.7601.18199)
IDE ATA/ATAPI controllers
AMD SATA Controller (driver 1.2.1.337)
Imaging devices
HP Officejet Pro 8600 (NET) (driver 9.0.0.0)
QuickCam Orbit/Sphere AF (driver 13.31.1044.0)
Keyboards
HID Keyboard Device (driver 6.1.7601.17514)
Mice and other pointing devices
HID-compliant mouse (driver 6.1.7600.16385)
Monitors
HP 2311 Series Wide LCD Monitor (driver 1.0.0.0)
Network adapters
Atheros AR8161/8165 PCI-E Gigabit Ethernet Controller (NDIS 6.20) (driver 2.0.11.12)
NETGEAR WNDA4100 N900 Wireless Dual Band USB Adapter (driver 3.2.7.0)
Network Infrastructure Devices
Microsoft Wireless Router Module (driver 1.0.0.2)
Portable Devices
G:\ (driver 6.1.7600.16385)
H:\ (driver 6.1.7600.16385)
I:\ (driver 6.1.7600.16385)
J:\ (driver 6.1.7600.16385)
TV04 (driver 6.1.7600.16385)
Printers
Fax - HP Officejet Pro 8600 (driver 3.0.0.0)
HP Officejet Pro 8600 (driver 6.64.0.994)
Processors
AMD A8-5500 APU with Radeon(tm) HD Graphics (driver 6.1.7600.16385)
AMD A8-5500 APU with Radeon(tm) HD Graphics (driver 6.1.7600.16385)
AMD A8-5500 APU with Radeon(tm) HD Graphics (driver 6.1.7600.16385)
AMD A8-5500 APU with Radeon(tm) HD Graphics (driver 6.1.7600.16385)
Sound, video and game controllers
IDT High Definition Audio CODEC (driver 6.10.6400.0)
NVIDIA High Definition Audio (driver 1.3.18.0)
NVIDIA High Definition Audio (driver 1.3.18.0)
NVIDIA High Definition Audio (driver 1.3.18.0)
NVIDIA High Definition Audio (driver 1.3.18.0)
Orbit/Sphere AF (driver 13.31.1044.0)
PlayOn Virtual Audio Device (driver 6.0.6000.5)
Storage volume shadow copies
Generic volume shadow copy (driver 6.1.7600.16385)
Generic volume shadow copy (driver 6.1.7600.16385)
Generic volume shadow copy (driver 6.1.7600.16385)
Generic volume shadow copy (driver 6.1.7600.16385)
Generic volume shadow copy (driver 6.1.7600.16385)
Generic volume shadow copy (driver 6.1.7600.16385)
Generic volume shadow copy (driver 6.1.7600.16385)
Generic volume shadow copy (driver 6.1.7600.16385)
Generic volume shadow copy (driver 6.1.7600.16385)
Generic volume shadow copy (driver 6.1.7600.16385)
Generic volume shadow copy (driver 6.1.7600.16385)
Generic volume shadow copy (driver 6.1.7600.16385)
Generic volume shadow copy (driver 6.1.7600.16385)
Generic volume shadow copy (driver 6.1.7600.16385)
Generic volume shadow copy (driver 6.1.7600.16385)
Generic volume shadow copy (driver 6.1.7600.16385)
Generic volume shadow copy (driver 6.1.7600.16385)
Generic volume shadow copy (driver 6.1.7600.16385)
Generic volume shadow copy (driver 6.1.7600.16385)
Generic volume shadow copy (driver 6.1.7600.16385)
Generic volume shadow copy (driver 6.1.7600.16385)
Generic volume shadow copy (driver 6.1.7600.16385)
System devices
ACPI Fixed Feature Button (driver 6.1.7601.17514)
ACPI Power Button (driver 6.1.7601.17514)
AMD SMBus (driver 5.12.0.13)
Composite Bus Enumerator (driver 6.1.7601.17514)
Direct memory access controller (driver 6.1.7601.17514)
File as Volume Driver (driver 6.1.7600.16385)
High Definition Audio Controller (driver 6.1.7601.17514)
High Definition Audio Controller (driver 6.1.7601.17514)
High precision event timer (driver 6.1.7601.17514)
HPCCF0E7 (HP Officejet Pro 8600) (driver 6.1.7601.17514)
IPBusEnum Root Enumerator (driver 6.1.7601.17514)
Microsoft ACPI-Compliant System (driver 6.1.7601.17514)
Microsoft System Management BIOS Driver (driver 6.1.7601.17514)
Microsoft Virtual Drive Enumerator Driver (driver 6.1.7601.17514)
Motherboard resources (driver 6.1.7601.17514)
Motherboard resources (driver 6.1.7601.17514)
Motherboard resources (driver 6.1.7601.17514)
Motherboard resources (driver 6.1.7601.17514)
Motherboard resources (driver 6.1.7601.17514)
Motherboard resources (driver 6.1.7601.17514)
Numeric data processor (driver 6.1.7601.17514)
PCI bus (driver 6.1.7601.17514)
PCI Express standard Root Port (driver 6.1.7601.17514)
PCI Express standard Root Port (driver 6.1.7601.17514)
PCI standard host CPU bridge (driver 6.1.7601.17514)
PCI standard host CPU bridge (driver 6.1.7601.17514)
PCI standard host CPU bridge (driver 6.1.7601.17514)
PCI standard host CPU bridge (driver 6.1.7601.17514)
PCI standard host CPU bridge (driver 6.1.7601.17514)
PCI standard host CPU bridge (driver 6.1.7601.17514)
PCI standard host CPU bridge (driver 6.1.7601.17514)
PCI standard ISA bridge (driver 6.1.7601.17514)
PCI standard PCI-to-PCI bridge (driver 6.1.7601.17514)
Plug and Play Software Device Enumerator (driver 6.1.7601.17514)
Programmable interrupt controller (driver 6.1.7601.17514)
R6300 (Gateway) (driver 6.1.7601.17514)
System board (driver 6.1.7601.17514)
System board (driver 6.1.7601.17514)
System CMOS/real time clock (driver 6.1.7601.17514)
System speaker (driver 6.1.7601.17514)
System timer (driver 6.1.7601.17514)
Terminal Server Keyboard Driver (driver 6.1.7601.17514)
Terminal Server Mouse Driver (driver 6.1.7601.17514)
UMBus Enumerator (driver 6.1.7601.17514)
UMBus Enumerator (driver 6.1.7601.17514)
UMBus Root Bus Enumerator (driver 6.1.7601.17514)
Volume Manager (driver 6.1.7601.17514)
Universal Serial Bus controllers
AMD USB 2.0 Hub (driver 1.0.0.66)
AMD USB 2.0 Hub (driver 1.0.0.66)
AMD USB 3.0 Host Controller (driver 1.0.0.66)
AMD USB 3.0 Host Controller (driver 1.0.0.66)
AMD USB 3.0 Hub (driver 1.0.0.66)
AMD USB 3.0 Hub (driver 1.0.0.66)
AMD USB 3.0 Root Hub (driver 1.0.0.66)
AMD USB 3.0 Root Hub (driver 1.0.0.66)
Standard Enhanced PCI to USB Host Controller (driver 6.1.7601.18251)
Standard Enhanced PCI to USB Host Controller (driver 6.1.7601.18251)
Standard OpenHCD USB Host Controller (driver 6.1.7601.18251)
Standard OpenHCD USB Host Controller (driver 6.1.7601.18251)
Standard OpenHCD USB Host Controller (driver 6.1.7601.18251)
USB Composite Device (driver 6.1.7601.18251)
USB Composite Device (driver 6.1.7601.18251)
USB Composite Device (driver 6.1.7601.18251)
USB Mass Storage Device (driver 6.1.7601.17577)
USB Mass Storage Device (driver 6.1.7601.17577)
USB Mass Storage Device (driver 6.1.7601.17577)
USB Mass Storage Device (driver 6.1.7601.17577)
USB Root Hub (driver 6.1.7601.18251)
USB Root Hub (driver 6.1.7601.18251)
USB Root Hub (driver 6.1.7601.18251)
USB Root Hub (driver 6.1.7601.18251)
USB Root Hub (driver 6.1.7601.18251)
WSD Print Provider
WSD Print Device (driver 6.1.7600.16385)