This fixes the nasty bug which causes the end of the config file to get corrupted after a while, which in turn caused the program to crash with “Invalid Property Value” the next time you ran it.
NOTE: If you have a corrupted config file (startup.cfg) left over from a previous version, you’ll need to delete that to allow the new version of SMP to run. If you don’t want to lose your settings and are feeling brave then you can open it up in Notepad and delete the last few lines which appear unusual (like several lines merged into one).
Hooray!