Just as a follow-up for anyone who’s interested...
It appears that the txfonts/pxfonts packages are not compatible with the
esint package that LyX uses for mathmode.
To disable it:
Go to Document > Settings...
Go to the ‘Math Options’ preferences pane.
Untick both the ‘Use esint package automatically’ and ‘Use esint package’.
It appears that the \varint command I referred to earlier is part of the
esint package, so it is no longer available.
Hope this helps!
Shay
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