Question: Internal representation of vectors has a bug?

I run Maple 15 on an Acer laptop with Windows 7 and have the following problem:

When my Maple documents become "too" long, some of the vectors I have created seem to become tables instead (without me doing anything) rendering vector multiplications and additions/subtractions impossible (they'll throw an error; something like it not being possible to multiply a vector and a table. As if one of the vectors in my multiplication has become a table). Should it happen, I can copy the code to a new document (without restarting Maple), and the representation of vectors will suddenly be correct and multiplication/addition/subtraction will be fine.

Does someone know the cause of this? 

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