[]Yes I fixed this here as well.
To fix this you need to edit showprofile.tmpl and change this:
<a href="{$config['phpurl']}/dosearch.php?Cat=$Cat&Forum=All_Forums&Words=$User&Match=Username&Searchpage=0&Limit=25&Old=allposts">
to this:
<a href="{$config['phpurl']}/dosearch.php?Cat=$Cat&Forum=All_Forums&Words=$CheckUser&Match=Username&Searchpage=0&Limit=25&Old=allposts">
And that should do the trick.
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Why am I not finding that in showprofile.tmpl?