The VST is a user mod (which isn't supported by LDW) and comes with no guarantees that it will work with anyone's Plant Tycoon game, or that you will never have problems with it. Borg does try to help people with his creation, but he can't anticipate every possible computer system configuration that people will be using VST on.

The best protection against such problems is to make regular backups of both the savegame files and the VST files.