<p>I moved a bunch of projects to Solution Folders to chop up our list of projects into manageable folders, now each of the folders projects are not in alphabetical order. This only occurs on machines other than my own. Any ideas how to alleviate this?</p>

See the following bug information on MS Connect:
https://connect.microsoft.com/VisualStudio/feedback/ViewFeedback.aspx?FeedbackID=312252&wa=wsignin1.0
To summarize:
"
The order they show up in solution explorer is the order in which they were written to the solution file.   However, if the folder is collapsed on startup it will be sorted when you expand it.
"
Therefore, the fast solution would be to hand edit the solution file and put the projects in the order you wish.