Can't tag friends on FB mobile app in status or comment...HELP!

When I first started using it, I was able to tag friends in comments and status updates just by starting to type their NAME. Then I had to use the @ symbol before the name. Now it won't tag friends at ALL (besides in pics) in any posts, status updates, or comments!
This is VERY frustrating, & I have been searching for an answer for 4 & 1/2 hours!
I just want to tag friends' names in my comments or posts.
I have uninstalled and reinstalled several times and no help.

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