When you train sometimes you will get x1 or even no exp at all. Yes I know this is annoying, but if you do a few of the following then you will get back to our normal x45 exp rate. So lets take a look shall we?
1: Most of the time this is caused by being in a party. But you can't just simply leave, you MUST leave the party by typing /leaveparty
2: #1 would only fail if you weren't in a party to begin with. No matter, create a party and type in /leaveparty
3: So that all failed huh? Try and relog/restart Maple Story
4: Relog and repeat #2
5: Re-enter the map you were fighting in; leave through the portal and get back in.
6: Die
7: Die and repeat #2
Mostly #1 has solved a lot of the x1 exp problems, hopefully you'll only have to do that. Hopefully you wont need to resort to the rest of the solutions. Anyways, enjoy.