Thanks , i did using old account which got that mission long time ago, but i never had any problems with my client (hope it didn't).
For job change quest, im doing the mission for RIN 4th Job "Chosen" , which i think it is also the old change job quest (Maybe). i just started to play again recently, and there's this 4th job change mission that need me to finish 250 monster 5 levels below or beyond my level. ( i checked the GP shop scroll, it started at Partusay, but this one start at The Wym's Maw)
I manage to finish them on a single day and not reporting it because i think it is not a major bug (just needed an extra effort) , but since it is also happened to my other quest i decided to post it here, who knows it might happen again to other job change quest . Thanks for Replying!