Have just had the same thing happen… any luck finding a fix (realizing your experience was a while ago now)? I had been installing an influxdb plugin when chromium seemed to freeze up. After a while I did a reboot on the system and suddenly screen resolution was limited to 640x480. A few reboots later I adjusted config.txt to alter the framebuffer_width and _height and then on next reboot the icons and wall paper reverted to defaults and temple image. Haven’t been able to find anything helpful as of yet. Thanks.
Think I determined the root of the wall paper issue… I’d apparently gone into Appearance Settings > Defaults and pressed one of the Set Default buttons located there. Rather than allow to review and modify defaults, that actually changes some settings to rpi system defaults… not the clearest UI. Anyway, knowing that, should be possible to just go reset the wall paper to the openplotter stock image and to reset taskbar icons.
As for the 640x480 res problem, had to change /boot/config.txt so hdmi_group=1 and hdmi_mode=4, per a thread elsewhere. Seems to have done the job.
Think I determined the root of the wall paper issue… I’d apparently gone into Appearance Settings > Defaults and pressed one of the Set Default buttons located there. Rather than allow to review and modify defaults, that actually changes some settings to rpi system defaults… not the clearest UI. Anyway, knowing that, should be possible to just go reset the wall paper to the openplotter stock image and to reset taskbar icons.
As for the 640x480 res problem, had to change /boot/config.txt so hdmi_group=1 and hdmi_mode=4, per a thread elsewhere. Seems to have done the job.