I have just released version 3.91 of STG FolderPrint Plus.
There are two changes in this release. First, I've fixed the Load Tree so as to open as read-only and avoid changing the last modified date of stgtree files.
Second, I usually save scans of drives. Yes, the program is fast but when you have several hundred thousands or millions of files – and specially when you turn Open Compressed Files – a scan can take a while.
One thing that really bothered me when opening a stgtree file is that the program just apparently froze, without any feedback. Now it displays a dialog with an animation, as well as a percentage bar and number of files read. And if you use Windows 7 it will also display progress on the taskbar.