Got this on the FMC this morning

So I was setting up a flight from ATL to MKJS using the following route that I built in FSC9  HYZMN NOFOR BRAVS WALET WALET OTK OCF DHP A509 URSUS UCA GONIS KIRAN KIRAN D333M LENAR  And I went in to set the SID/STAR. Setting the SID was no problem but when I went to set the STAR that was when everything went to crap.  First try the FMC locked up, FSX froze up and crashed. Second and third attempts attempt I entered the flight again then I get this PIN error on the FMC and then I loose all control of the FMC. NO inputs.  The final attmept I entered everything again but this time I selected the arrival runway without selecting the STAR and everything is good.  so could the STAR of MKJS be corrupt?