Fix the TOC Drag and Drop Grouping Feature
We are experiencing inconsistent performance with the TOC editability. It often crashes or does not work. Specifically, when trying to drag slides into groups, we are not able to drop the slide into the group. We also experience crashing occasionally when trying to rename items in the table of contents. We have gotten it to work in one project, but are having inconsistent results with other projects.

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AdminShivang (Admin, Adobe Captivate) commented
If you haven't already, please install the latest Captivate update (v12.6) and check if it resolves the reported issue. You can either install it from Help->Check for Updates or by downloading setup from here: https://adobe.com/products/captivate/vipdownload.html
If the issue persists, please ensure that the projects are saved locally and not being accessed from a network/shared drive and check if it works fine