Are you using all 3 computers with VSD, or transferring from one to the other?
Do they all have the same operating system on them?

no everything is on my laptop........but after I complete the website we would like to install VSD onto our server.

Do you have alot of pages open at the same time and then try to save?
Does it not save after you have added a certain item into your page?
One time I've open VSD twice and didn't realize it and couldn't save, is this possible?

Sorry for so many questions