Page tool window won't scroll

since updating indesign cc 2015, pages dialogue box won't let me scroll down see , select of pages. can scroll partway down, instance, view page thumbnails of 1-57, cannot scroll further, see rest of pages (in specific example 89 page document. case in documents, though, regardless of how many pages. i've attached screenshot of page dialogue box there 89 total pages, cannot scroll down past point shows select or rearrange of hidden pages.

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