I'm a newb myself, and was having issues using switches. I was creating an event that caused an invisible barrier to appear around an area during a mini-game, so the player couldn't push any of the event items out of the mini-game area. I was trying to have the barrier appear when the game was active, but disappear if the player wanted to quit the mini-game and return later. The barrier should have returned once the mini-game was restarted.
The barrier would initially appear at the beginning of the mini-game, then disappear if the player wanted to leave. For the life of me, I couldn't get the barrier to reappear once the game was reactivated.
I had a hard time visuallizing what event steps the barrier was going through and when, to understand where I was going wrong. So, I visually "labelled" each of my conditional statements with different balloon icons. Thus, as my event carried through, I could note what condition was occuring when, and see exactly what conditions were not being accessed by the game.
This is what my event ended up looking like:

Once I visually labelled my conditional statements, I noticed the last balloon icon that would appear when the player would chose the Restart option (which turned the Flower Barrier = off) was the exclamation (3rd page). This told me that my Self Switch control on the 3rd page was incorrect.
I fiddled around and realized that I needed to turn Self Switch: B =OFF, instead of turning Self Switch: A =ON to have my event return to the 2nd page.
I realize this problem may have been somewhat basic to some, but this post is to focus on using balloon icons as visual aids when facing an event issue. I've seen from other posts that the Moderators encourage solving problems on our own, so I wanted to share this tool's usefulness. It was also extremely satisfying to see the final lightbulb icon once my event condition worked!
I then of course, when through and deleted all of my balloon icons once the event was working :p