In recent days, some apps in flatpak are no longer working properly (they used to work fine) and do not show their window / GUI properly - eg some of the GUI has black rectangles in it. The GUI does not respond to mouse clicks sometimes. Also they are intermittently taking 100% CPU processing.
An example app that is having this issue is flatseal.
Other apps still function fine, such as shortwave.
Any help much appreciated. Please let me know if I can provide further info.
@tingping - Thank you also for your reply.
I am sorry but I am an end user of flatpak and do not now what it means to test runtimes.
I tried to learn more about what you mean by eg searching for:
flathub install older runtime
and found articles like:
in which the OP does not understand things either
and Downgrading | Flathub Documentation which seems to be oriented to developers eg using terms like “Then you deploy the commit:” which I have no idea of what this would mean.
I just noticed that flatpak has a “repair” command. Seems like a sensible thing to try. I have ran and it did not complete properly. I am going to make another post about this.