route is assigned but plane seems to be sitting on the ramp

I have an issue with my three latest routes, could be a bug..
I assigned the aircraft, and on the flight tab, the flights appear (so they exist I guess) but having 0% loadfactors and not generating any costs either, so they don´t loose money on those routes, profit is also 0 $ and not negative, so it seems they don´t even moved from the ramp and in the end the flights don´t exist , and they are only a Fata Morgana...
If I try to update the route prices, it won´t let me do so. It takes me to a blank page..., but just for this three routes, all other routes can be updated without any problem (they do slowly, but they do).
I also cancelled all flights on those routes, and tried to set them up new but it didn´t work either...
No idea what this can be

3.1 realistic, routes AGP to HGH, WUH, and CSX if this info helps.

Cheers and Thanks,

rgss