Thanks for reporting. Imprints created on version 0.23.1 worked fine, but those created before didn't. I fixed the issue (I hope) and release new version, 0.23.2. Be sure to write if it's still broken.
I also fixed the problem with the mutant hunter. Thanks for reporting.
As a sidenote, I created new topic specificaly for bug reports. In the future, I would like everyone to post any bugs you find there, or in the latest blog post. Thanks.