There's a problem with the stock tcl implementation on Macs. The advice to install the ActiveState version of TCL that @Doitsu mentioned has been in Sigil's release notes for several versions.
Quote:
Attention Mac OS X Users
Per the recommendation of www.python.org (see https://www.python.org/download/mac/tcltk/), due to bugs and the age of Apple's internal Tcl library, you should also download and install ActiveState's ActiveTcl Community Edition. To get the latest bug fixes, Sigil-0.9.8's embedded Python has been linked with the very latest version: Tcl 8.6.4.1
We may not redistribute this Package with Sigil due to ActiveState's binary non-redistribution policy.
So please, if you have not already done so download and install this version of ActiveState's Active Tcl Community Edition, until we get a chance to do our own build of Tcl 8.6.4.1 from source for future releases. ActiveState is a primary contributor to www.python.org and a respected and trusted source for python and tcl/tk related binaries on both Windows and Mac OS X.
See: http://www.activestate.com/activetcl/downloads
Version: 8.6.4.1
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