Columns in all text boxes are frozen at 2. New and old text boxes. Can't increase or decrease. Can't span.
What have I tried? Setting default columns with no document open, checking paragraph styles, reading forums.
I've used InDesign for years. This is a brand new problem.
Check the [Basic Text Frame] object style, too, and if you continue to have trouble in new docs trash the prefs (see Replace Your Preferences). Changes you make with no files open will not affect any existing file -- you have to correct those one at a time.
Thank you very much for your help. I actually discovered a very easy go-around. I dragged an existing text box without those pesky columns into my Adobe Creative Cloud Library, and just drag it out when I need it.
After the holidays I'll try the real remedy.