Problem with child style when upgrade 4.1.5 to 4.1.7.

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i has setup more template base on Parent Style is default template. My system run ok at 4.1.5 version. When upgrade to 4.1.7 , forum with a child style alway auto show to default template.

i'm try under steps :

Step 1 - Add New Style name : Template1 ( With Parent Style is Default )

Step 2 - Select Forum Manager -> Select: Forum1 -> Select: Style Options with Custom Style for this Forum is Template1 -> Select Override Users' Style Choice.

Step 3 - Style Manager -> Cate 1 -> Edit Template -> Edit ad_global_below_navbar .

in 4.1.5, i has template default of Forum1 is Template1. ad_global_below_navbar show for advertising of this forum. it's good to me.

in 4.1.7 when upgraded , Forum1 alway used default template . ad_global_below_navbar show advertising of home forum (default template). it's wrong with me.

Please help me how to fix this problem.