I've messed with OPUS without a backup and now want to go back to its factory condition - no funky theme, etc. Can I do that without a reinstall?
According to this post, a clean install is the best way:
resource.dopus.com/viewtopic.php ... ht=factory
btw, why don´t you use the backup function? That way you can change whatever you want & restore it at any point.
That linked post is old and refers to Opus 8's registry settings. Opus 9 keeps its settings in files. There's a FAQ on where to find them.