Hi All I had exactly the same problem but I believe I found a solution! Windows 10 64-bit, Adobe Reader DC Problem: I suddenly discovered that could not use the cursor to drag cursor over text within a PDF either. This prevented me from, e.g., highlighting, selecting and inserting a digital signature (which is executed by drag command). And yes: Select tool ACTIVATED. Copy text ALLOWED in document security settings. For weeks I tried all kinds of things - reinstalling, repairing. What bugged me is that it DID work correctly at first on a brand new Windows 10 laptop. My other Windows 7 laptop was unaffected. I had to move to the other laptop to be able to perform the functions. Frustrating. Today, however, I found an option here: Edit > Preferences > Security (Enhanced) > Sandbox protections Enable Protected Mode at startup UNCHECK this box, close Reader DC and reopen. Voila, drag function (and all its dependent commands) restored. I hope it works for you, and that it works for all other users who have asked a similar question on this forum, e.g. cannot select, cannot highlight, cannot copy text, cannot drag cursor, cannot insert digital signature, unable to digitally sign PDF Good luck
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