XScreenSaver 5.21 out now. Just a few minor fixes to the desktop version, really. (Oh and this.) I'm not going to bother rolling a new iOS release for this version.

HEY YOU: If you are a Linux user, will you please report a bug against your distro and ask them to upgrade to this version? I'm getting really tired of getting bug reports about things that I fixed two years ago because Debian (for example) is still shipping 5.15.

And the modern batch of Linux fanboys don't seem to comprehend that this makes the answer to the question "are you running the latest version?" be "no".