Reloading page while Modal dialog is up can cause you to lose scrollbar
Summary:
Originally: when you're on a page that is larger than the screen, and you upload a photo, the page's scrollbar is gone when you are done. This is no longer true since we replaced the upload-photo workflow, but it can still happen if anything goes wrong in displaying a Bootstrap Modal. (For example, we had a bug where the client was throwing an exception if you clicked on a thumbnail when there was no target -- the scrollbars would go away.)
This problem is most often associated with Photos, since that is where we've been using Bootstrap Modals, but the problem isn't about Photos per se. The issue seems to be that Bootstrap removes the scrollbar when you display a Modal; if something prevents that Modal from being properly dismissed, the scrollbar doesn't come back until you reload the entire Client!
