About the bug of imfilter of R2017a, it seems that a patch will be released in the next week.
https://www.mathworks.com/support/bugreports/
#Bug ID: 1554862
(日本語) ビックデータアクティベーション研究センター
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A bug in imfilter
A bug was found in the imfilter function of MATLAB R2017a Image Processing Toolbox. An erroneous solution can be obtained with the “circular” option.
It’s magic. R2017a gives a different result from R2016a/b with the following simple code…
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