saving ses files

[Boruch Baum]

I'm having trouble identifying a bug. In my 'loaded' emacs v26.1
session, I can't save any form of ses file; emacs says "saving ...." but
never returns, until I C-g out, and the file isn't saved. However, no
such problem exists when trying the same for a new "emacs -Q -nw"
session. Does anyone have any pointers how to track down what is hanging
the save command?

Some notes:

1) toggle-debug-on-error isn't catching anything.

2) Even though emacs isn't returning from the save command, it is
   auto-magically creating backup files (eg. #1.ses$, 1.ses~).

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