CrossOver for Linux was updated to v14.1.0 on March the 17th. Please update the ebuild in the tree. The changelog: 'http://www.codeweavers.com/products/faq/change_log/' mentions "Added a new option, --destdir, to various internal CrossOver command line tools. This may make package generation for Gentoo Linux easier." This sounds like a solution for bug #538004.
Even with 14.1.1 and using the latest ebuild renaming it to that version, it fails with the same sandbox errors :(
v14.1.3 was released but I don't know if it addresses the sandbox errors.
CrossOver for Linux was updated to v14.1.4 on June the 25th. The changelog: 'http://www.codeweavers.com/products/faq/change_log/' "* Fixed a Steam crash on launch for Win7 Bottles. * Fixed problems browsing and searching in the Steam game store." Sandbox errors still exist with current ebuild installation method. I wonder if there is an alternative to using cxmenu that does not cause permission errors? Or another method of installing, such as using the archive's built-in installer? I will try to look at this more in depth, possibly this weekend.
I see 14.4.1 version in the tree