Starting Rawtherapee in terminal gives the following output: terminate called after throwing an instance of 'std::logic_error' what(): basic_string::_S_construct null not valid Aborted I'm using the latest version of Gentoo Hardened kernel.
Please post your `emerge --info media-gfx/rawtherapee' output in a comment.
My mistake - system encoding issue probably caused this Rawtherapee problem. Other applications did a better job of informing about the cause - (encoding configuration problems), but this was not a Rawtherapee bug.