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Sadly going to suggest that you reboot (restart) the computer and come back if that doesn't solve things?
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Check your keyboard and mouse first.. if you have optional hardware items try to use..
I had exactly the same issue, all tools went haywire right in the middle of working on a brochure. I followed all suggestions I came across in other forums – I removed 3rd party extensions, trashed preferences AND InDesign SavedData (with Cache folder) before finally reinstalling. Unfortunately none of those worked until I rebooted based on @Eternal_Warrior's suggestion. Boom! Everything went back to normal.
I still don't know why it happened (perhaps a bug in InDesign?). It cost me two day's work!