From various sources it can be concluded that during the time of Chazal the version of the Tanakh was for the most part fixed and uniform, but in some instances there arose questions of textual variants, and where such details as plene (Maleh) or defective (Hasser) spelling were concerned there was a lack of clarity, which became more pronounced during the period of the Amoraim.

Courtesy of the Virtual Beit Midrash, Yeshivat Har Etzion