After upgrading to 2015 from 2013 I’m now getting some weird behavior out of the revision blocks. If I click on a cell to edit it (and even if I don’t edit anything in the cell), Solidworks is inserting the text “G2” (sometimes G4 also) wherever the cursor was. This is happening so far in any drawing file I open which had been created in a prior version of SW but does not happen when I am creating a new drawing. Here's what it looks like:

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Does anyone know what's causing this and/or a fix?