Cannot Open Display: :0 / No Protocol Specified. After reboot, programs can't launch. (XFCE) (KDE)

kde
xfce
desktop-environment
gui
manjaro-architect
#1

Coming from HERE

Here are the errors!
Launching palemoon :

(pale moon:3199): Gtk-WARNING **: 00:18:47.904 Locale not supported by C library.
                Using the fallback 'C' locale.
No protocol specified
Error: cannot open display: :0

Launching konsole :

No protocol specified
qt.qpa.xcb: could not connect to display :0 
qt.qpa.plugin: Could not load the Qt platform plugin "xcb" in "" even though it was found.
This application failed to start because no Qt platform plugin could be initialized. Reinstalling the application may fix this problem.

Available platform plugins are: wayland-org.kde.kwin.qpa, eglfs, linuxfb, minimal, minimalegl, offscreen, vnc, xcb.

`konsole` terminated by signal SIGABRT (Abort)

Launching Falkon = same Qt error above.

Launching manjaro-hello :

Warning: Application Browser plugin not found : No module named 'application_utility'
No protocol specified
Unable to init server: Could not connect: Connection refused

(manjaro-hello:3472): Gtk-WARNING **: 00:39:09.364: Locale not supported by C library.
                Using the fallback 'C' locale.
No protocol specified
Unable to init server: Could not connect: Connection refused 
Traceback (most recent call last):
  File "/usr/bin/manjaro-hello", line 347, in <module> 
    hello = hello()
  File "/usr/bin/manjaro-hello", line 31, in __init__
    Gtk.Window.__init__(self, title=" Manjaro Hello", border_width=6)
  File "/usr/lib/python3.7/site-packages/gi/overrides/Gtk.py", line 519, in __init__
    "Gtk couldn't be initialized. "
RuntimeError: Gtk couldn't be initialized. Use Gtk.init_check() if you want to handle this case.

EDIT: Logged-in as root, created an additional "standard" account; again could launch applications, then could not sometime after reboot. By the time I was done connecting to WIFI I was back on pkill -u $USER on yakuake ( F12, only program that'd run).

Don't want to do another fruitless install in vain, something has to give.

EDIT: 2

@jonathon How do I delete a thread?

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Exiting tty2 returns a message on a black backdrop in bold, stating "The screen locker is broken and unlocking is not possible anymore" (KDE).
Cannot Open Display: :0 / No Protocol Specified. Programs can't launch. (XFCE) (KDE)
unlisted #2
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#3

@jonathon Thanks.

EDIT: Oh boy, nvm.

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