Issue with same inputs. One worked, the other not

[Nay]

Thanks Atom, unfortunately I'm on OSX and the beta release doesn't seem to have a .app to run it, if I'm not mistaken.

Besides, I've just made an artificial hash to reproduce the error, if that's still of any help :

1. With -O parameter, which worked :

hashcat -O -m 500 -a 3 -1 ?l?d?u '$1$pdQG$xpOTb2OXGpAY1qhATa5Oq.' ?1?1?1?1_test

$1$pdQG$xpOTb2OXGpAY1qhATa5Oq.:Ge6k_test                  
                                                          
Session..........: hashcat
Status...........: Cracked
Hash.Type........: md5crypt, MD5 (Unix), Cisco-IOS $1$ (MD5)
Hash.Target......: $1$pdQG$xpOTb2OXGpAY1qhATa5Oq.
Time.Started.....: Sun Jul 22 13:32:59 2018 (9 secs)
Time.Estimated...: Sun Jul 22 13:33:08 2018 (0 secs)
Guess.Mask.......: ?1?1?1?1_test [9]
Guess.Charset....: -1 ?l?d?u, -2 Undefined, -3 Undefined, -4 Undefined
Guess.Queue......: 1/1 (100.00%)
Speed.Dev.#2.....:    79285 H/s (5.79ms)
Speed.Dev.#3.....:    75903 H/s (2.57ms)
Speed.Dev.#*.....:   155.2 kH/s
Recovered........: 1/1 (100.00%) Digests, 1/1 (100.00%) Salts
Progress.........: 1363968/14776336 (9.23%)
Rejected.........: 0/1363968 (0.00%)
Restore.Point....: 0/238328 (0.00%)
Candidates.#2....: G8dz_test -> G0m0_test
Candidates.#3....: jura_test -> jrmj_test

2. Without -O parameter, didn't work :

hashcat -m 500 -a 3 -1 ?l?d?u '$1$pdQG$xpOTb2OXGpAY1qhATa5Oq.' ?1?1?1?1_test


Session..........: hashcat                                
Status...........: Exhausted
Hash.Type........: md5crypt, MD5 (Unix), Cisco-IOS $1$ (MD5)
Hash.Target......: $1$pdQG$xpOTb2OXGpAY1qhATa5Oq.
Time.Started.....: Sun Jul 22 12:02:58 2018 (4 mins, 33 secs)
Time.Estimated...: Sun Jul 22 12:07:31 2018 (0 secs)
Guess.Mask.......: ?1?1?1?1_test [9]
Guess.Charset....: -1 ?l?d?u, -2 Undefined, -3 Undefined, -4 Undefined
Guess.Queue......: 1/1 (100.00%)
Speed.Dev.#2.....:    37571 H/s (0.44ms)
Speed.Dev.#3.....:    12304 H/s (2.12ms)
Speed.Dev.#*.....:    49875 H/s
Recovered........: 0/1 (0.00%) Digests, 0/1 (0.00%) Salts
Progress.........: 14776336/14776336 (100.00%)
Rejected.........: 0/14776336 (0.00%)
Restore.Point....: 238075/238328 (99.89%)
Candidates.#2....: XVxU_test -> XQzF_test
Candidates.#3....: XwTq_test -> XGvX_test