Hi, some systems like X-3043 should be accessible much later during story-line and therefore accesses are locked during active missions. But they still exist in times when is player between missions (this way is freelancer vanilla coded) and this result in problems. With lvl going up is campaign reactivated and it will close some of jumps etc. and player get stuck. I personally recommend to avoid travels into systems like Custodian or X-3043 (and adjacent) early. Is good to keep in mind that Crossfire mod adds tons of new things into old game engine and complete freedom when playing campaign (which have rich storyline) is relative.
Thank you for your response. I thought this was the problem.
In any case, it is good to know that among the main story missions it is possible to use most Crossfire gates / Jumpholes, but not to sell items from wrecks / escapes pods in the Alaska system, for example.
Good flight!