Comment 3 for bug 951597

That was me - to add,
What's happening now is lines are being written but inside the file, not at the end. Also every time it writes a line some are removed.
Ex. - the file is now1886 lines. (xs1). I take a screenshot, (xs2) , a couple of lines are written, several are removed -

$ diff /home/doug/Desktop/xs1 /home/doug/Desktop/xs2
350d349
< ull)
352,358c351,352
< `menu_proxy_module_load': guayadeque: undefined symbol: menu_proxy_module_load
<
< Gtk-WARNING **: Failed to load type module: (null)
<
< `menu_proxy_module_load': guayadeque: undefined symbol: menu_proxy_module_load
<
< Gtk-WARNING **: Failed to load type module: (null)
---
> ** WARNING **: Unable to use GNOME Shell's builtin screenshot interface, resorting to fallback X11. Error: GDBus.Error:org.freedesktop.DBus.Error.ServiceUnknown: The name org.gnome.Shell was not provided by any .service files
> NG **: Failed to load type module: (null)