Created attachment 180816 [details] A Screencast Demonstrating The Problem SUMMARY KHelpCenter's QtWebEngine instance is transparent, and produces "ghost windows". [^1] STEPS TO REPRODUCE Merely invoke `khelpcenter`. SOFTWARE/OS VERSIONS I am using `khelpcenter-25.04.0-1.fc42.x86_64` on: > Operating System: Fedora Linux 42 > KDE Plasma Version: 6.3.4 > KDE Frameworks Version: 6.13.0 > Qt Version: 6.9.0 > Kernel Version: 6.14.4-300.fc42.x86_64 (64-bit) > Graphics Platform: Wayland > Graphics Processor 1: AMD Radeon RX 5700 > Graphics Processor 2: AMD Radeon Graphics ADDITIONAL INFORMATION The version of KHC I'm using isn't listed in `enter_bug.cgi`'s `<select id="version">` field, so it's listed as "Unspecified". [^1]: https://superuser.com/revisions/629766/1#content:~:text=That%20is%20called%20a%20%E2%80%9Cghost%20window%E2%80%9D
(In reply to Roke Julian Lockhart Beedell from comment #0) If this isn't reproducible by the triage owner, I shan't be surprised if this is related to https://bugs.kde.org/attachment.cgi?id=178177&action=edit and/or https://bugs.kde.org/attachment.cgi?id=180786&action=edit.
(In reply to Roke Julian Lockhart Beedell from comment #0) The strange behaviour isn't visible if a screenshot is captured via "Active Window" mode in Spectacle, as is usually the case. Perhaps that gives you a better idea of the cause.
Created attachment 180819 [details] An "Active Window" Screenshot (In reply to Roke Julian Lockhart Beedell from comment #2) ...Actually, it does: it's transparent in the screenshot!
Created attachment 180820 [details] A "Full Screen" Screenshot
Looks like the Qt 6.9 QtWebEngine AMD bug: https://bugreports.qt.io/browse/QTBUG-135786 KDE Discuss post: https://discuss.kde.org/t/plasma-6-3-4-may-have-broken-text-rendering-or-something-else-on-my-system/32523
(In reply to John Kizer from comment #5) Thanks! It is: https://discuss.kde.org/t/some-of-my-kde-apps-arent-working-properly/32522/21?u=rokejulianlockhart.