Only been playing VV for a few days. The initial time I played, any time a mushroom popped up, I could get the kids to pick it. Now, no matter which kid I use, and how many times I drop them on or around the mushroom, they only pick it about 50% of the time (the ones they ignore like they don't exist eventually disappear). What's going on? Is this normal, and that first time they luckily always picked it, or is it a glitch?

which version are you running? this was a glitch in version 1.00, but it's been fixed in version 1.01. if you need to update, redownload the trial version from the site you purchased the game from, and install it to the same folder.