It wasn't but that's okay for now. I had to set my computer back to factory in order to reinstall SH3D and have it work. Going to be far more careful from here on out.

Edit to previous post. Here's the error log I get:

java.lang.ArrayIndexOutOfBoundsException: -326
at java.util.ArrayList.elementData(Unknown Source)
at java.util.ArrayList.get(Unknown Source)
at com.eteks.sweethome3d.io.ContentDigestManager.getResourceContentSize(Unknown Source)
at com.eteks ...

After I tried using this tool, I re-imported a couple of the edited furniture libraries. SH replaced the deleted items with a big red X and then crashed. It will no longer open. I've uninstalled, reinstalled the latest version, installed version 6, and still nothing. Using on Windows 10. Is there ...