Maya "New default menu" error

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I have an issue with newly installed Maya 2016 on my Macbook. I get a dialogue box which has the following text:
New default menu sets found
New menu sets are available. Your menu set preferences must be updated to accept them.
Custom menu sets will not be affected.
It goes on to say that this is required for getting Maya to function properly. However, upon attempting this, I'm only left with a Command Window, and Maya closes. Here's the info from that:
// AbcExport v1.0 using Alembic 1.5.4 (built May 9 2014 15:43:11)
// AbcImport v1.0 using Alembic 1.5.4 (built May 9 2014 15:43:11)
// BifrostMain plug-in loaded (built Feb 26 2015 18:00:13)
// Error: line 1: Cannot find procedure "rebuildShowMenu". //
updateRendererUI;
Anyone know how to fix this error? Thank you.