On one of my Sandbox parks in RCT3, the peeps pay at the entrance but then can't enter the park. They are still counted in the visitor counter, but cannot get into the park, and it says they are 'lost'. I can't just pick them all up and put them into the park cos they disappear somewhere and I can't see them! 
It's obviously some glitch, but after spending ages creating the park, then opening it and this happening, I wanted to know if there was any way to fix it!

It's obviously some glitch, but after spending ages creating the park, then opening it and this happening, I wanted to know if there was any way to fix it!