I tried your script, got the fillowing:

I'll now open https://www.perlmonks.org  (will be in incognito mode de
+spite incognito => 0)
error when connectingInternal Exception at /usr/local/lib64/perl5/5.30
+.1/WWW/Mechanize/Chrome.pm line 993.
 at /usr/local/lib64/perl5/5.30.1/Future.pm line 899.
    Future::result(Future=HASH(0x55e2e584d3c0)) called at /usr/local/l
+ib64/perl5/5.30.1/Future.pm line 926
    Future::get(Future=HASH(0x55e2e584d3c0)) called at /usr/local/lib6
+4/perl5/5.30.1/WWW/Mechanize/Chrome.pm line 993
    WWW::Mechanize::Chrome::_connect(WWW::Mechanize::Chrome=HASH(0x55e
+2e4ab30d0), "mute_audio", 0, "pid", 17465, "launch_exe", "/usr/bin/ch
+romium", "writer_fh", ...) called at /usr/local/lib64/perl5/5.30.1/WW
+W/Mechanize/Chrome.pm line 966
    WWW::Mechanize::Chrome::new("WWW::Mechanize::Chrome", "mute_audio"
+, 0, "autoclose", 0, "autodie", 0, "incognito", ...) called at /home/
+rwk/mech-sample.pl line 99
    main::start_new_instance("/usr/bin/chromium") called at /home/rwk/
+mech-sample.pl line 14
[download]

I am using WMC 0.56

BTW, Thanks for all your work on this!!!! WMC appears to be VERY useful (once I get it working).