@davidfor: I've just double-checked this issue with the latest 64bit Sigil 0.9.0 version and wasn't able to reproduce the bug described by
DNSB.
The problem was most likely caused by an older Sigil version and or problems with external Python interpreters. I.e. there's nothing for you to fix.
@DNSB: Could you please provide the following information:
OS:
Sigil version:
Installed Python version(s):
Also please indicate whether you've installed the 32bit or 64bit versions of Sigil and Python.