Have not seen this happening in Plasma 5.5, but only since 5.5.95. I should mention, that I performed the upgrade to Qt 5.6 at the same time, currently it's the release version 5.6.0. I have to move panels around quite often, because plasmashell keeps placing them on the wrong screen. (There is a bug report about that and I'm CCed on it.) Reproducible: Sometimes Steps to Reproduce: 1. Open the panel settings 2. Click on "Screen Edge" and drag the panel around 3. Dragging the panel to a different screen seems to trigger the bug more often, as well as changing to horizontal/vertical layout. (right/left edge instead of top/bottom edge) I have seen it on the same screen as well, though. Actual Results: The panel movement gets stuck in between, panel background and settings background are painted, but not the panel content. plasmashell does not respond anymore (neither panel, nor desktop) and has to be killed. Expected Results: Should work The last messages from the journal: Mar 16 18:43:18 orionis plasmashell[1160]: Both point size and pixel size set. Using pixel size. Mar 16 18:43:18 orionis plasmashell[1160]: Both point size and pixel size set. Using pixel size. Mar 16 18:43:19 orionis plasmashell[1160]: file:///usr/share/plasma/plasmoids/org.kde.plasma.battery/contents/ui/batterymonitor.qml: QML Plasmoid: Cannot anchor to an item that isn't a parent or sibling. The last one 12 times. Then the log is spammed with this message: Mar 16 18:43:19 orionis plasmashell[1160]: QTransform::translate with NaN called Until I kill plasmashell.
I can confirm this bug on plasma 5.5.95, Qt 5.6.0 final (build with the 3 recommended patches from https://mail.kde.org/pipermail/kde-distro-packagers/2016-March/000138.html). This is on systems without dual monitor setup. Same behavior on ATI system running with X or wayland, or nvidia non-free system.
Yes, all three patches were applied before building Qt 5.6.0. Does not matter for this one, though. This happens with and without the patches.
Issue is fixed here with just tagged and released to packagers Plasma 5.6.0 final.
Ok, thanks for checking back. Bernd - I'll assume this is fixed with 5.6.0. If you can still reproduce, please reopen this bug.
Yes, looks good. Haven't seen it yet, at least. If so I'll let you know. Thanks.