Hdmi matrix losing signal

So recently i bought myself a hdmi matrix for more hdmi inputs. Plugged into it is my main computer, my xbox and my htpc. Its working great so far, the only problem is that if i play movies from my htpc it loses the signal from time to time. The htpc is an nvidia ion board running xbmc-standalone with nvidia driver.
lspci gives
00:00.0 Host bridge: nVidia Corporation MCP79 Host Bridge (rev b1)
00:00.1 RAM memory: nVidia Corporation MCP79 Memory Controller (rev b1)
00:03.0 ISA bridge: nVidia Corporation MCP79 LPC Bridge (rev b3)
00:03.1 RAM memory: nVidia Corporation MCP79 Memory Controller (rev b1)
00:03.2 SMBus: nVidia Corporation MCP79 SMBus (rev b1)
00:03.3 RAM memory: nVidia Corporation MCP79 Memory Controller (rev b1)
00:03.5 Co-processor: nVidia Corporation MCP79 Co-processor (rev b1)
00:04.0 USB controller: nVidia Corporation MCP79 OHCI USB 1.1 Controller (rev b1)
00:04.1 USB controller: nVidia Corporation MCP79 EHCI USB 2.0 Controller (rev b1)
00:06.0 USB controller: nVidia Corporation MCP79 OHCI USB 1.1 Controller (rev b1)
00:06.1 USB controller: nVidia Corporation MCP79 EHCI USB 2.0 Controller (rev b1)
00:08.0 Audio device: nVidia Corporation MCP79 High Definition Audio (rev b1)
00:09.0 PCI bridge: nVidia Corporation MCP79 PCI Bridge (rev b1)
00:0a.0 Ethernet controller: nVidia Corporation MCP79 Ethernet (rev b1)
00:0b.0 IDE interface: nVidia Corporation MCP79 SATA Controller (rev b1)
00:0c.0 PCI bridge: nVidia Corporation MCP79 PCI Express Bridge (rev b1)
00:10.0 PCI bridge: nVidia Corporation MCP79 PCI Express Bridge (rev b1)
00:15.0 PCI bridge: nVidia Corporation MCP79 PCI Express Bridge (rev b1)
00:16.0 PCI bridge: nVidia Corporation MCP79 PCI Express Bridge (rev b1)
00:17.0 PCI bridge: nVidia Corporation MCP79 PCI Express Bridge (rev b1)
00:18.0 PCI bridge: nVidia Corporation MCP79 PCI Express Bridge (rev b1)
03:00.0 VGA compatible controller: nVidia Corporation ION VGA (rev b1)
04:00.0 Network controller: Atheros Communications Inc. AR9285 Wireless Network Adapter (PCI-Express) (rev 01)
The configuration is quite simple, there is the standard 20-nvidia.conf in /etc/xorg.conf.d/ and pretty much nothing more, i can't find any error in Xorg.0.log exept for some warning, witch shouldn't matter that much
[ 5765.490] (WW) NVIDIA(0): Option "TwinViewXineramaInfoOrder" requested "CRT", but no
[ 5765.490] (WW) NVIDIA(0): such display device could be found, or all display devices
[ 5765.490] (WW) NVIDIA(0): by that name are currently unavailable.
[ 5765.490] (WW) NVIDIA(0): Option "TwinViewXineramaInfoOrder" requested "TV", but no such
[ 5765.490] (WW) NVIDIA(0): display device could be found, or all display devices by
[ 5765.490] (WW) NVIDIA(0): that name are currently unavailable.
Only thing i can see from that is that it uses nvidia-auto-select to choose the right resolution, which is the correct one.
I checked all the cabels, i replaced the cables with that from the working devices(no problems with xbox or my main pc), but still the same problem. So i'm beginning to think that i did configure something wrong, but can't figure it out perhaps. System is up to date with all packages.
So any hints or ideas i could try will be greatly appreciated. One thing that makes me think that maybe its the hdmi matrix is that i don't get a lost signal when i plug the htpc directly into the beamer. But maybe there are some further ideas what i could try do configure differently. The resolution and hertz of all devices are the same and i played the same movies on my main pc and my htpc, so the hdmi matrix should be able to handle it.
So thanks in advanced!
thanks in advanced!

I am happy to say to the problem is solved. The projector was set on "auto" for computer input. So, it should have detected that the VGA cable was no longer connected, but the HDMI cable was. It failed to do that. By forcing it to look at the HDMI input, it worked. The Mini correctly identified the projector and set the resolution correctly. Now, I just have to try the splitter and see if that will work.
Thanks for the help.

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