I found a second problem with the FMC:
I tried to set the FlightPlansFolder option in the ifg.cfg, i.e. I set it to: c:\\dokume~1\\user\\eigene~1\\flight~1
(I made sure that this folder exists!)
I can load the flightplans of my FS2004 now with the MCU, but the FS2004 crashes every time, when I try to open the FMC. (I get an error in the "kernel.exe" module.)
I tried to write the folder name in any other way (long folder name, without two "" etc.), but I don't have luck, i.e. FS2004 crashes every time when I try to open the FMC.
However I can use the FMC with your default path, if I don't set the FlightPlansFolder option.
It should only be slash for the path delimeter '\' not two.
But send me your isg.cfg file (with the full path and only one slash delimiter), and I'll try to re-create the problem here.
As far as I recall, the FMC does not try to read the flight plans list until you press the 'FPL' button. So this could be caused by another setting.
Another possibility could be too many files in the folder. I think there's a limit of about 200.
But I'll look into it.