I've spent a fair amount of time explore EXP, mainly because I like to explore.

I've found what appears to be a bug. If I explore Organia for the first time with a character, and then quit right after, I'm almost guarunteed 2,000 explore exp.

If I explore Organia for the first time with a character, then go to another area, maybe go pk some, and quit 3 hours later, I get nothing.

Same thing for HTS and Whistlewood. I get EXP if I quit fairly quickly, and I don't if I stay on for a few more hours. It never seems to fail.