Question: Bugs in parsing?

Hello there! Maple 2016.1 sometimes gets crasy about parsing input strings. I managed to capture this behaviour in the attached file. It looks like below. I am not sure what exactly triggers it. It just starts happening all of a sudden. What might be the cause...? 

 

"1 Pi"

Error, incorrect syntax in parse: `;` unexpected (near 4th character of parsed string)

"1 Pi"

 

"Pi/(2)"

Error, invalid semantics "π"

"Pi/2"

 

"1"

Error, incorrect syntax in parse: `;` unexpected (near 4th character of parsed string)

"1"

 

``

 

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