As far as I can tell from the manual, View/Text Symbols should toggle the view for tabs and anchors, but it doesn't.
Framemaker 2017, v. 22.214.171.1241 on Windows
Yes, that should toggle those invisible characters. I suggest you contact Adobe support
But first, update to 14.0.3 from the Help menu in Fm.
For the record, upgrading didn't help, but thank you! It will probably help relieve some of the other little things I've been experiencing.
Have you tried renaming your 14 dir in your preferences file?
It's an easy way to have Fm rewrite the prefs file, which occasionally gets corrupted
One additional note: tabs, anchors and markers all overprint. When you see an anchor, there may be one anchor there, or 10 or 100. Unless you space them out, or use the arrow keys to move between them, you can't see how many there are. Markers do the same thing, as do tabs when you haven't defined tab stops.
P.S. If it ends up being a font display issue, this thread may help. View text symbols do not display index markers
Good to know, thanks!