I saw on another forum that some ppl complaining that the romcenter dat file crashed romcenter. I use my own rom manager, and while looking at the result table, I noticed a required rom with no name and crc of 00000000. This might be the cause of the crash, and it might be an idea to remove this line. Do a Find for Sengoku 3 (Decrypted C) set, look for and remove the faulty line. Then see if romcenter works.