Thanks for the tip about downgrading. I downgraded a few hours ago and it seems to be stable so far. Here is the link if anyone needs it:
https://downloads.wordpress.org/plugin/google-calendar-events.3.1.33.zip
Hopefully one of the developers will resolve the conflict soon (though it does seem like SC is the bigger issue, with potential conflicts with Updraft and other plugins).
I have the EXACT same combination. It’s very hard to choose between no calendar and no gallery!
Thanks, James. I’ll have a look. In the meantime I had the site reverted to Wp 4.3.2. and the above issue seems to be resolved for now. I can’t really afford any updates until the end of the month so if I should close this thread until I can replicate the error, please let me know.
Thanks!