Hashcat can't crack hash after 1 day.

Hello guys,

So, im using the GUI version of oclHashcat and my graphic card is nVidia GeForce GT 630 in a pc.
The hash I tryied to crack is an MD5(Wordpress) xxxxxxxxxxxxxx
I don't know if hashcat is working correctly, because the first time I used hascat to crack the above hash was yesterday. I left the pc all night but till now I dont have a result.
the Recovered bar is on 0/1 <0.00%> Digests, 0/1 <0.00%> Salts.

Consider that all the hashes I tryied to crack had the same result and never been cracked.

Is there something wrong whit hashcat?

Thanks in advance for your help guys.