When trying to save a profile, the window buttons are unresponsive. Neither save nor cancel the operation.
Info: Arch xfce4-panel 4.16.4
moved from xfce/xfce4-panel#596 (moved)
As of the trace you posted in xfce/xfce4-panel/#596 I would say, one of the desktop files is corrupt.
Can you grep them for X-XFCE-Source?
X-XFCE-Source
They reside in ~/.config/xfce4/panel/
~/.config/xfce4/panel/
mentioned in merge request !20 (merged)
closed with merge request !20 (merged)
mentioned in issue xfce/xfce4-panel#596 (moved)
assigned to @luzip665
changed milestone to %1.0.14