Using Acrobat DC on Windows 7. Both fully updated. In the past when using acrobat I would open and drag the thumbnails pane to show, for example, thumbnails two wide. However, now it seems to be stuck on seven wide and I cannot get it back to stay where I drag it. If I drag it back to two wide, the next document I open and click on the thumbnails pane, it opens to seven wide again. I don't know why this is happening. I do know when it happened/changed. I combined about four documents together by dragging each one into an existing open document and pulling the thumbnail pane wide to see more page thumbnails. In the past when I've done this, I drag it back to two wide and then the next document I open and click the thumbnail pane it stays at two wide. Done it this hundreds of times and it has always worked this way. I know there is a setting in the preferences, documents, 'restore last view settings when opening documents'. However, I've never had that checked off in the past and most of the pdf's I open are new documents. I did check the box but it made no change on opening new documents. By new documents I mean existing ones, whether from coworkers or the web. I've also 'pinned' and 'unpinned' the page thumbnails but no change. I've run a repair on Acrobat but no change. Any help would be appreciated. Thanks.
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