In v7 of Google Earth there currently is an issue with recording tours. When opening balloons while recording a tour they subsequently fail to open or come up blank. The steps below solved the problem for me:
Folder based tours HowTo:
1] Create placemarks with appropriate views. If you want a photo or text to show up, put it in the description box (note you can put videos in also but this technique won't get them to auto play on opening)
2] Create a folder
right click temporary places folder > add > folder
drag all your placemarks into the folder and arrange in the order you want them to play.
PC: File menu > Options (I think) > touring > When creating a tour from a folder (box) > select 'Show balloon when waiting at features' tick box.
Mac: Google Earth menu > Preferences > touring > When creating a tour from a folder (box) > select 'Show balloon when waiting at features' tick box.
4] While you have the dialog box open adjust 'Time between features', 'Wait at features' to figures that work for your tour.
5] Find the folder 'play tour' button. Its a folder icon with a arrow in it far bottom right of the Places column. Click it and your tour will play.
6] You can adjust the sequence of placemarks and the speed with which the tour flies at and how long it pauses for using steps  and .