when I use mentions, I get this:
array(4) { [0]=> array(3) { ["file"]=> string(44) "/home/*/public_html/Sources/Search.php" ["line"]=> int(2178) ["function"]=> string(9) "log_error" } [1]=> array(3) { ["file"]=> string(47) "/home/*/public_html/Sources/Subs-Post.php" ["line"]=> int(2251) ["function"]=> string(13) "findSearchAPI" } [2]=> array(3) { ["file"]=> string(42) "/home/*public_html/Sources/Post.php" ["line"]=> int(2199) ["function"]=> string(10) "modifyPost" } [3]=> array(3) { ["file"]=> string(35) "/home/*/public_html/index.php" ["line"]=> int(151) ["function"]=> string(5) "Post2" } } Error loop.
Looks similar to this: https://www.simplemachines.org/community/index.php?topic=570223.0
Is this a fresh 2.1 install or did you upgrade? Any other errors?
Did you apply the fix from https://www.simplemachines.org/community/index.php?topic=566687.0 ? Because if not, that's going to end somewhat badly.