Basic iRule not working after upgrade

You mentioned that you want to direct traffic if the URI "contains" that string, which may be the problem. Try using the "contains" or "starts_with" operator instead. You might also want to make the comparison case-insensitive, and a switch statement might be in order as well -- try one of these:

when HTTP_REQUEST {
  if { [string tolower [HTTP::uri]] contains "/jive" }{
    pool Jive_Web
  } elseif { [string tolower[HTTP::uri]] contains "/webnow" }{
    pool WebNow
  } else {
    persist cookie insert wldevpool
    pool Weblogic
  }
}

or:

when HTTP_REQUEST {
  switch -glob [string tolower [HTTP::uri]] {
     Adjust wildcards as necessary.
     "/jive* is equivalent to "starts_with /jive"
     "*jive* is equivalent to "contains jive"
    "/jive*"    { 
      pool Jive_Web
    }
    "/webnow*"  { 
      pool WebNow
    }
    default     { 
      persist cookie insert wldevpool
      use pool Weblogic
    }
  }
}

HTH

/deb