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Question: Maple returning "_SELECTION" instead of a real output

Question:Maple returning "_SELECTION" instead of a real output

JBrew13 5 Maple 2018
2dmath
April 10 2018
1

I've been using Maple 2018 only a few days now, was mostly using Maple 2016 and never had any issues with returning an output (at least one that wasnt my fault), but with 2018 I've seen a few times where a simple task would return an output of "__SELECTION" and then my input. No idea what this is or why its happening and all I really need to know is how to prevent it from happening. If its something with my preferences or settings that needs to be addressed, thats fine, but otherwise this is getting to be a real pain. See attached 

 
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