Dose to water issue

Dear Fluka Experts,
I try to simulate carbon beam (HEAVYION) in patient anatomy (imported DICOM files) and score the physical dose with USRBIN and Cartesian geometry. As long as I score dose to media (DOSE) simulation runs just fine. However when I try to score dose to water (DOSE-H2O), some of runs (not all of them) finish with errors. The results of runs that finished successfully look as expected. Simulations are done using Fluka 4-4.0 with Flair 3.3-0.3.

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Similar error was reported before for protons and alpha particles (Fortran runtime error), but it was solved with new release (I was able to score dose-to-water for protons with new release). Is it possible that present problem is somehow connected?
I have another question connected to dose-to-water scoring. For calculation of dose to water RAD-BIOL card need to be there with the file describing biological parameters for different particles, because otherwise running simulation will result with error. I would like to confirm that this file is not used in any way for dose-to-water calculation (but only when we score dose with cards TPSSCORE, ALPHA-D and SQBETA-D)? If it is not used, I would like to ask if there a way making scoring dose-to-water possible without it?
Best regards,
Marta