[rossy]

> VLC in a nutshell: Rebuilding fonts...

I wonder if this is still a problem (I haven't used VLC in a while.) That message box is shown when fontconfig rebuilds its font cache, but libass has been able to run without fontconfig since 0.13.0 (October 2015.) I guess it depends on whether the current release version of VLC still needs it.

[dEnigma]

It happened to me on the current Windows version just a few days ago. But it doesn't seem to happen as often as in the past.