Hi I have a problem, I can't write here a names of missions because I haven't english version of game. In that mission where I have to destroy that huge robot (if there is more of those missions then the first one), after I destroy him (or it?) one of my.... fellow? Anyway, he just stay on some ruff and he don't want to go to others, so I can't complete the mission. I did try it only ones because I need atleast 30 minutes to destroy him and I don't want to do it again for nothing.

Sorry if there are any faults.

I think you are talking about the Pinger. There are three encounter with that thing. The frist is in probably Bryant Park I dunno. After that there is one in another park. The third is in Grand Station. But I haven't found any bugs in those encounter, not on any difficulty.

Eventually there should be a convoy of trucks arrive to take you away and the mission ends. There is likely a location that acts as a trigger to start that sequence. Try moving your player around - especially in the area around that soldier that speaks to you and near the back of that map section.

Also make sure you are patched up and everything. Playing through again will usually fix errors like this.