Maplestory doesn't reopen properly after being minimized

This problem only occurs on my older computer. It runs XP.

Sometimes, after I minimize the screen of my Maplestory (alt+tab), when I try to reopen my Maplestory window the game doesn't come back up. Instead, the Maplestory icon on my taskbar flashes orange, my desktop shortcuts jitter, and my mouse pointer doesn't work. But the Maplestory screen itself doesn't open. When I check Task Manager, it says Maplestory is still running.

Soo... does anyone know what's wrong with Maplestory/my computer?

A) How long are you leaving it minimized for?
B) How long do you usually wait for it to come back up?

A) How long are you leaving it minimized for?
B) How long do you usually wait for it to come back up?

It varies. Sometimes it's just for 30 minutes, other times longer. It's probably important to note that this doesn't happen EVERY time, just some of the time.

I usually wait like at least a minute before giving up and closing MS through the Task Manager.

Edit: Ok, apparently it happens without any set period of time.