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Here's what happens: under certain circumstances Firefox and Thunderbird seem to just not refresh or display on the screen (not even sure how to describe this). The windows are open. So far, these two Mozilla programs seem to be the only ones affected. Their entire windows are gray and blank. If I try to exit I get the message "This window might be busy and is not responding. Do you want to terminate the application?" It's like they want to refresh themselves for the display but can't. If I terminate and re-open, everything seems normal again.
The circumstances when it happens: so far I've seen it happen when I background X and enter a TTY terminal and then return to X. Also it seems to happen after leaving a screensaver or xlock.
My last two recent system changes from around when this started happening (not saying they're related), the past few days:
1) installed GIMP and a few attendant libraries on my desktop, so maybe it's some kind GTK problem? Or Glib (see below)?
2) did the Java upgrade intervention - https://www.archlinux.org/news/java-use … e-upgrade/ (almost certainly irrelevant, just being thorough!)
Not sure any of them matter, but other details:
• When I start firefox or thunderbird in the terminal, I get something like: (process:28331): GLib-CRITICAL **: g_slice_set_config: assertion 'sys_page_size == 0' failed
• I use a pretty vanilla xfce4 as my preferred window environment. Now and then I monkey around in other environments.
• I pretty much just track pacman for all my software.
• uname -a: Linux thanatos 3.16.4-1-ARCH #1 SMP PREEMPT Mon Oct 6 08:22:27 CEST 2014 x86_64 GNU/Linux
Other than to do pacman -Syu and reboot, I haven't even attempted any remedies.
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Well, partial solution: reinstalled Thunderbird and Firefox. Seemed to fix this issue in Thunderbird, but not in Firefox.
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Further update: okay, it doesn't seem to be happening (anymore?) when I use xlock or a screensaver. It does still happen when I switch from X11 to the terminal and then back to X11. May have happened randomly once too.
I see a similar thread where someone seems to have the same or a related issue: https://bbs.archlinux.org/viewtopic.php?id=188484 (also no solution).
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