Update: A workaround for this problem is included in Directory Opus 9.1.1.8 which just came out.
Please see Heads-up: dopus_fileinfo crashes and solution if you're using this plugin and have found Opus crashes sometimes.
Hopefully it'll be easy to fix but I figure the mysterious crash may be causing problems for some people so it's worth giving everyone a heads-up on how to avoid it for now.