I see that Skype for Linux Beta 5.3.0.1 and 5.4.0.1 have effectively been superseded by
Skype Preview for Linux, which is currently at Version 8.6.76.56247.
There is an ebuild request in the Gentoo Bugzilla for the new version (
Gentoo Bug No. 629464). I created an ebuild for Skype Preview in my local overlay by renaming the ebuild for Skype for Linux Beta 5.4.0.1 to net-im/skypeforlinux-8.6.76.56247.ebuild and changing the URL of the source repository (SRC_URI). The ebuild does install Skype Preview for Linux without any apparent problems.
However, although Skype for Linux Beta 5.3.0.1 and 5.4.0.1 work in my Gentoo Linux installation, Skype Preview for Linux (8.6.76.56247) does not. When I try to sign in, the sign-in window displays the message "Oops, there was a problem with Skype. Try signing out and back in.", and "STARTUP_LOAD_ERROR" appears below the white button with "Sign out" on it.
No matter how many times I sign out and sign in again, the same thing occurs.
This happens irrespective of whether or not the firewall is enabled.
I have already posted about this problem in the Skype Community forum (see first link above for thread). Any suggestions on what I can do to the ebuild, if anything, to get Skype Preview to work? At the moment I have had to revert to Skype for Linux Beta.