I found a problem with the file PAK oasis with water, I can not start Simutrans and gives me the following error:
"FATAL ERROR: hausbauer_t:: register_Besch ()
building sh_oasis_seasons duplicated "
What pak version did you use? And did you by any chance use a new version and did not use a new clean & empty folder for it?
Sound like the same object is contained in more than one file or so...?