Collaborate pop-up only display loading... or black screen - 5.5xf3

Launched and connected shader compiler UnityShaderCompiler after 0,01 seconds
[1201/151704:ERROR:browser_main_loop.cc(207)] GLib-GObject: invalid cast from 'GtkDrawingArea' to 'GtkDialog'
[1201/151704:ERROR:browser_main_loop.cc(207)] Gtk: IA__gtk_dialog_get_content_area: assertion 'GTK_IS_DIALOG (dialog)' failed
Issue TrimJob to reduce GI Cache size to maximum 10GB at: '/home/amarok/.cache/unity3d/GiCache'
[00:00:00] Enlighten: Precompute started.
TrimDiskCacheJob: Current cache size 0mb
[00:00:00] Enlighten: Finished 1 Layout Systems job (0,00s execute, 0,00s integrate, 0,28s wallclock)
[00:00:01] Enlighten: Finished 1 Tetrahedralize Probes job (0,00s execute, 0,00s integrate, 0,30s wallclock)
[00:00:01] Enlighten: Precompute took 0,580707 seconds.
Enlighten scene contents:   0 geometries.   0 instances.   0 systems.   0 probe groups.   0 cube maps. Scene is up-to-date.
Setting up 2 worker threads for Enlighten.
  Thread -> id: 7fc32a1b9700 -> priority: 1
  Thread -> id: 7fc32960c700 -> priority: 1
UPID Received '53581662-f70a-45b1-8cc8-207036373f35'.
Refresh: detecting if any assets need to be imported or removed ... Refresh: elapses 0,031721 seconds
Refreshing native plugins compatible for Editor in 0,19 ms, found 0 plugins.
Preloading 0 native plugins for Editor in 0,00 ms.

----- Total AssetImport time: 0,032968s, AssetImport time: 0,000000s, Asset hashing: 0,000000s [0 B, 0,000000 mb/s]

[00:00:04] Enlighten: Bake started.
[00:00:04] Enlighten: Finished 1 Bake Runtime job (0,17s execute, 0,00s integrate, 0,21s wallclock)
[00:00:04] Enlighten: Bake took 0,215115 seconds.
[00:00:04] Enlighten: Reflection Probes started.
[00:00:05] Enlighten: Finished 1 Ambient Probes job (0,00s execute, 0,00s integrate, 0,06s wallclock)
Starting cubemap convolution for '' (size 128)
[1201/151709:ERROR:nss_ocsp.cc(617)] No URLRequestContext for NSS HTTP handler. host: ocsp.digicert.com
[1201/151709:ERROR:nss_ocsp.cc(617)] No URLRequestContext for NSS HTTP handler. host: ocsp.digicert.com
[1201/151709:ERROR:nss_ocsp.cc(617)] No URLRequestContext for NSS HTTP handler. host: crl4.digicert.com
[1201/151709:ERROR:nss_ocsp.cc(617)] No URLRequestContext for NSS HTTP handler. host: ocsp.digicert.com
[1201/151709:ERROR:nss_ocsp.cc(617)] No URLRequestContext for NSS HTTP handler. host: ocsp.digicert.com
[1201/151709:ERROR:nss_ocsp.cc(617)] No URLRequestContext for NSS HTTP handler. host: crl4.digicert.com
...took 0,170 seconds
[00:00:05] Enlighten: Finished 1 Reflection Probes job (0,43s execute, 0,00s integrate, 0,74s wallclock)
[1201/151711:ERROR:browser_main_loop.cc(207)] GLib-GObject: invalid cast from 'GtkDrawingArea' to 'GtkDialog'
[1201/151711:ERROR:browser_main_loop.cc(207)] Gtk: IA__gtk_dialog_get_content_area: assertion 'GTK_IS_DIALOG (dialog)' failed
[1201/151711:ERROR:nss_util.cc(93)] Failed to create /home/amarok/.pki/nssdb directory.
[1201/151711:ERROR:nss_util.cc(211)] Error initializing NSS without a persistent database: NSS error code: -8023
[1201/151711:FATAL:nss_util.cc(213)] nss_error=-8023, os_error=0

In 5.4.3 it working perfectly, using Ubuntu 16.10.

Confirmed, will be fixed in the next build. As a workaround for the “black screen” issue there or in the history window, you may be able to downgrade your libnss to 3.23 or earlier.

Thanks, downloading: http://packages.ubuntu.com/xenial-updates/amd64/libnss3/download