4 FloppyDTV DVB-S card problem (1 Viewer)

[AlphaXT]

TV-Server Version: tvengine3-06-16-2007--01-22h--Rev14904
MediaPortal Version: MediaPortal_0.2.3_RC1
MediaPortal Skin: Default
Windows Version: Tested on Windows Vista and XP
CPU Type: Tested on P3 1Ghz, P4 2Ghz, Core 2 Duo 4200 and Athlon X2 3800+
HDD: from 20 to 400go
Memory: from 512mo to 2go
Motherboard: Dell and Asus
Motherboard Chipset: I845PE, I815, I965 and Nforce 4
Motherboard Bios:
Video Card: Geforce 4, FX, 7200 and 8600
Video Card Driver: Latest
Sound Card: Creative live, audigy and soundmax
Sound Card AC3:
Sound Card Driver:
1. TV Card: Floppy DTV-S
1. TV Card Type:
1. TV Card Driver: Latest
2. TV Card: Floppy DTV-S
2. TV Card Type:
2. TV Card Driver: Latest
3. TV Card: Floppy DTV-S
3. TV Card Type:
3. TV Card Driver: Latest
4. TV Card: Floppy DTV-S
4. TV Card Type:
4. TV Card Driver: Latest
MPEG2 Video Codec: Clean windows install, only those provided with MP
MPEG2 Audio Codec: Clean windows install, only those provided with MP
Satelite/CableTV Provider: Hotbird, Astra 1, Astra 2, Atlantic Bird 3 and Arabsat
HTPC Case:
Cooling:
Power Supply:
Remote: MCE
TV:
TV - HTPC Connection:

First of all, I have to say that so far I've had a great time with MediaPortal (for almost a year) and the TVServer (since it's out), especially since 2.3 RC1 still did not crash even once on my install (1 dedicated server, 4 clients for now).

However I have one problem with my current install: I can't manage to get the 4 floppyDTVs work at the same time. The 4 of them are working great separately (I tested by switching priorities in TVServer). Up to 3 different transponders (1 per card) everything runs smoothly on my 4 clients (2 of them watch either the same channel or 2 different channels on the same transponder). But when I try to use the 4th card I almost immediatly get an error : unknown error occured and it switches back to the previous channel (on mp, on tvserver preview, error is the same but I just get grey window, and same error in tvserver manual control).

Here the relevant Server configuration :
Celeron 2Ghz (northwood)
RAM 1 go
40go HDD
Gigabit network card (on gigabit switch)
Vista (for now but had the same problem under xp)
VIA OHCI Compliant IEEE 1394 Host Controller (that may be the problem)
Latest firmware and driver for FloppyDTVs (bda of course).
Earlier TVserver builds had the same problem.

Anyone ever met this problem ? Any idea what's wrong ?

Thanks

and again, Thanks a lot to MP devs for their amazing work.