No problems with launching Qt apps in Plasma after this update, QtEmu built with v5.15.0 runs fine, Cantata (from repos) also works as expected.
Thanks for the quick build of qt5-base, @oberon!
Figured it out. Some theme thing.
I had gtk2 style selected in qt5ct. With kvantum it’s ok.
arch wiki saved my ass again 
https://wiki.archlinux.org/index.php/Qt
(at the very bottom)
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All my qt apps failed also. Looks like qt5-styleplugins needs to be rebuilt for Qt 5.15.1. (@nightmare-2021?)
If you don’t want to wait for the new Manjaro package, it can also be rebuilt using AUR. That worked for me.
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Ahh, that’s the one. Thanks.
No problem, I can wait. I was just a bit a amazed that a patch version of qt could break so many things.
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I’ve just uploaded a rebuild to unstable
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Unfortunately, plasma5-applets-plasma-pstate causes Plasma to crash now (after updating to Qt 5.15.1) 
Krusader does not start because of conflicting QT-libraries, some other apps do the same.
(12.09.2020) - I reverted to testing.
…
I had kvantum style selected in qt5ct. Error:
Cannot mix incompatible Qt library (5.15.0) with this library (5.15.1)
installed qt5-styleplugins (5.0.0.20170311-23)
and did the update “unstable” again (13.09.2020):
Krusader works again.
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I haven’t ran the update yet, but people on Arch are reporting massive issues after the qt5 update to 5.15.1, and I know some of them seem to be solved here, but the multi-monitor one mentioned on reddit (why can’t we post links here?) isn’t mentioned in this thread. I suppose I can update and maybe downgrade if I encounter issues, but I have to have dual-monitor functionality so it’ll be a PITA if it’s borked. Someone here mentioned that qt5-base is on 5.15.1-3 in the repos, but my update is only showing 5.15.1-1. Fingers crossed, will report back.
Weird, I’m on qt5-base 5.15.1-1 and I don’t have the issue others are talking about with dual monitors. Awesome. Anyways, fully updated, everything is fine (except obviously the gparted bug which I bisected and reverted).
Discussing that question would be very off-topic for this thread, but maybe just a little off-topic would be to suggest that, if you cannot post a link, simply paste it in your post, then highlight it, then click the preformatted text icon (</>)
gparted issue is fixed with 5.8.9-2 (xfce)
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One more strange issue is Plasma has begun half-loading on a separate display: laptop’s one loads fine on startup, but the external one shows only Latte dock and top panel, the remaining space is simply black and doesn’t react to right-clicks, for example. Restarting Plasma manually makes it load properly, but on the next login I see the same behavior. Reproducible with another user’s account (test acc, default settings).
Problems for me too on a triple monitor setup, I have a black box on the wallpaper, and I can’t see and reach the icons on the top of the desktop, the notification appears on the left top angle of the center monitor instead of the top right, even the startup splash screen seems to be off center.
Are you sure?
Phil’s top post links to: https://gitlab.manjaro.org/-/snippets/541/raw
and I see:
qt5-base 5.15.0-5 5.15.1-1
Which matches mine in unstable KDE-Dev:
$ pacman -Qi qt5-base
Name : qt5-base
Version : 5.15.1-1
Description : A cross-platform application and UI framework
Architecture : x86_64
URL : https://www.qt.io
Licenses : GPL3 LGPL3 FDL custom
Groups : qt qt5
Provides : None
Depends On : libjpeg-turbo xcb-util-keysyms xcb-util-renderutil libgl fontconfig
xdg-utils shared-mime-info xcb-util-wm libxrender libxi sqlite
xcb-util-image mesa tslib libinput libxkbcommon-x11 libproxy libcups
double-conversion md4c icu
Optional Deps : qt5-svg: to use SVG icon themes [installed]
qt5-wayland: to run Qt applications in a Wayland session [installed]
qt5-translations: for some native UI translations [installed]
postgresql-libs: PostgreSQL driver
mariadb-libs: MariaDB driver
unixodbc: ODBC driver
libfbclient: Firebird/iBase driver
freetds: MS SQL driver
gtk3: GTK platform plugin [installed]
perl: for fixqt4headers and syncqt [installed]
Required By : appstream-qt attica-git bluez-qt-git breeze-gtk-git karchive-git
kcodecs-git kconfig-git kcoreaddons-git kdnssd kdsoap kholidays-git
kitemmodels-git kitemviews-git kjs kuserfeedback-git kwayland-server-git
kwidgetsaddons-git libaccounts-qt libdbusmenu-qt5 libkdcraw libkexiv2
manjaro-settings-manager modemmanager-qt-git networkmanager-qt-git octopi
packagekit-qt5 phonon-qt5 polkit-qt5 poppler-qt5 prison-git
pulseaudio-qt python-pyqt5 qca qt5-declarative qt5-multimedia qt5-script
qt5-sensors qt5-svg qt5-tools qt5-translations qt5-x11extras qtermwidget
signond solid-git sonnet-git syntax-highlighting-git threadweaver-git
vlc
Optional For : avahi cmake libde265 openal pinentry v4l-utils
Conflicts With : qtchooser
Replaces : None
Installed Size : 64.06 MiB
Packager : Bernhard Landauer <oberon@manjaro.org>
Build Date : Sat 12 Sep 2020 10:57:56 AM EDT
Install Date : Sun 13 Sep 2020 05:41:43 PM EDT
Install Reason : Installed as a dependency for another package
Install Script : No
Validated By : Signatureyakuake has a white background now…
Dark as ever on my end. Did you try re-applying profiles and/or background color settings?
gparted issue is fixed with 5.8.9-2 (GNOME)
verified.
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yes i am sure that this was the case.
however, it no longer is.
therefore, i have downgraded to the official version as well:
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Yeah. -3 was there for like 30 minutes. Then it was set back to -1
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