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Hi,
Except the method exposed by Stewdio, for this moment I don't have a solution ! Sorry. Mithrandir and I, we have spent much time to find why and how.
But there's something I have remarked, it's often the users who are using the default template set who have the problem.
Clone the default template set, give it a name and in your preferences, select it. In some cases it have solved the problem.
Bye,
Hervé