Ok, got a result. input_len is 12. At least it was 12 in the single test run we managed to complete before lunch. Next thing I'll try is:

        if (input_len != 8) {
            printf("blowfish_crypt(): handling %d bytes\n", input_len)
+;
            printf("Bytes: ");
            for (i = 0; i < input_len; i++) {
                unsigned char a = (unsigned char) *(input + i);
                printf("%d ", a);
            }
            printf("\n");
            croak("input must be 8 bytes long");
        }
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But again I have to wait. Seems I'm the only person around who's not at lunch right now...

PS: I know that my C code is ugly, but at least it works. ;-)