As described here: https://youtrack.jetbrains.com/issue/IDEA-248140#focus=Comments-27-4622292.0-0 The following files need to have executable permissions in order for Markdown preview (and possibly other functionality) to work: /opt/pycharm-professional/jbr/lib/jcef_helper /opt/pycharm-professional/jbr/lib/chrome-sandbox /opt/pycharm-professional/jbr/lib/jexec /opt/pycharm-professional/jbr/lib/jspawnhelper If you open a project that has a markdown file currently open, it will try to load the preview, fail because of the permissions and PyCharm will crash. After changing these files to 755 permissions everything works ok. Creating an issue rather than a quick PR to fix this because I'm not sure if there might be security implications.
PS: other JetBrains tools are (probably) also suffering the same issue, haven't verified.
Seems this was fixed some time ago in: https://gitweb.gentoo.org/repo/gentoo.git/commit/?id=b68efb6ec1f063f6451c24b21af0abfc165f3f5e fperms 755 "${DIR}"/"${JRE_DIR}"/lib/{chrome-sandbox,jcef_helper,jexec,jspawnhelper}
