You should not be using 3.1beta for sure. The most recent version for 3.0 is "3.0.1 (Build - 2016051100)".
If you want to upgrade to Moodle 3.1, you can use questionnaire release "3.1.2 (Build - 2016071300)".
mike
Questionnaire (plugin)
Branching Questionnaire - not sure=
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