On my KDE neon system, a 'save as' file dialog frequently does not appear when it should. I experience this with a variety of applications, most often with the Vivaldi browser, but also when trying to download and save file from the Telegram desktop application. In the case of Vivaldi, I can work around the problem by not clicking "Save as..." but simply "Save" (to the default location), in which case the file is downloaded without problems.

I noticed that after this happens, any Dolphin windows that are currently open freeze, are non-responsive.

This really hinders my workflow. Any help would be appreciated.

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Operating System: KDE neon 5.19
KDE Plasma Version: 5.19.4
KDE Frameworks Version: 5.73.0
Qt Version: 5.14.2
Kernel Version: 5.7.0-050700-generic
OS Type: 64-bit
Processors: 8 × Intel® Core™ i5-8250U CPU @ 1.60GHz
Memory: 23,4 GiB of RAM
Graphics Processor: Mesa Intel® UHD Graphics 620


(NB: I have a 5.7 kernel to make my Thunderbolt docking station work with my Lenovo Thinkpad laptop; the problem that I describe has occurred even with the standard kernel that ships with KDE neon.)