Problems inserting text into shapes

Hello,

I am using Storyline 2 and  have encountered an error whilst attempting to insert text into a shape.  My usual steps are: right hand click on the shape > select 'edit text', and that usually that works. But on this occasion I am presented with a big red cross (see attached image). 

Has anybody had this problem, and/or has a solution?

Thank you in advanced for any help. 

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