Sylpheed crashing

["Ian D. Leroux" <idleroux%fastmail.fm@localhost>]

I've started seeing intermittent segfaults with sylpheed-3.5.1,
generally while fetching a message from an IMAP server. I haven't yet
managed to rebuild all the relevant libraries with debug symbols, so
the backtraces in the core dumps aren't especially informative, but
FWIW:

[New process 1]
[New process 59]
[New process 54]
Core was generated by `sylpheed'.
Program terminated with signal SIGSEGV, Segmentation fault.
#0  0x000076b5cf0c50f3 in ?? ()
[Current thread is 1 (LWP 1)]
(gdb) bt
#0  0x000076b5cf0c50f3 in ?? ()
#1  0x000076b5cec00675 in ?? () from /usr/lib/i18n/libmapper_zone.so.5.0
#2  0x000076b5dfdf0ac0 in ?? ()
#3  0x000076b5cec00c89 in _fini () from /usr/lib/i18n/libmapper_zone.so.5.0
#4  0x0000000000000000 in ?? ()

Any hints? Has anyone else seen anything similar?

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IDL