If I put a "pause" into /usr/sbin/shutdownconfig at line #678:
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echo 678; read x
and this is what causes the save dialog to not appear.[xcb] Unknown sequence number while processing reply
[xcb] Most likely this is a multi-threaded client and XInitThreads has not been called
[xcb] Aborting, sorry about that.
gtkdialog: ../../src/xcb_io.c:641: _XReply: Assertion `!xcb_xlib_threads_sequence_lost' failed.
Only seems to happen on my desktop with 8-core Intel Xeon processor - my Celeron laptop offers the save dialog OK.
I've tried similar experiments with ScPup64 and DPupBuster64 as being closest woof-ce pups in build time to FossaPup64 and they do not give the above errors so save proceeds as expected.