So this does seem to be the same omtc bug(#1083071) that has been reported
against FF. Manually adding:
user_pref("layers.offmainthreadcomposition.enabled", false);
to prefs.js corrects the problem I was experiencing. My system also has an
Intel HD chip alongside the Nvidia one which is using the default Windows 7
drivers version 8.15.10.2321. No upgrades are offered via the "Update Driver"
button in Windows but I will check to see if something is available directly
from Intel.
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