What version of InDesign are you using?
Can you give us a screen shot of the Pages panel? When you clcik the loaded cursor, do you click and release, or drag a frame? Do you click on a guide?
Steve and Peter,
Thank you for responding (I was expecting an E-mail notification of responses, otherwise I would have replied earlier).
As it turns out, it appears something was wrong with my Master page. I had a similar Master page in the same document, and it auto-flowed the same Word text without any problem, so I just made a copy of that Master page and used it with full success.
I (thoughtlessly) deleted the original Master page, I probably wouldn't be able to recreate the same problem to figure out what happened. Practically, I don't need to know anyway, since everything is working fine now!