Usu­al­ly, this hap­pens with files being loaded into the library don’t have the required reg­u­lar expres­sion pat­tern that XBMC is look­ing for, when it loads files into the library. That reg­u­lar expres­sion is usu­al­ly in the form of anything_s01e02 for exam­ple (sea­son num­ber, and episode num­ber). When this occurs, you may still view the episodes but you have to go through the “Files” way of view­ing it; not through your TV’s library (like the oth­er TV episodes them­selves).

After going through XBMC wik­i’s page regard­ing “Nam­ing video files/TV shows,” here’s the Nzb­Drone set­tings that I use now to rename my Ani­me episode files:

For easy copy­pas­ta:

• Stan­dard Episode For­mat
  Ex. Series_Title_2010.s01e01_Episode_Title_(1)

  {Series_CleanTitle}.s{season:00}e{episode:00}_{Episode_Title}

• Dai­ly Episode For­mat
  Ex. Series_Title_2010.2013–10-30_Episode_Title_(1)

  {Series_CleanTitle}.{Air-Date}_{Episode_Title}

• Ani­me Episode For­mat
  Ex. Series_Title_2010.s01e01_Episode_Title_(1)

  {Series_CleanTitle}.s{season:00}e{episode:00}_{Episode_Title}

• Ani­me Episode For­mat
  Ex. Series_Title_2010.s01e01_Episode_Title_(1)

  {Series_CleanTitle}.s{season:00}e{episode:00}_{Episode_Title}

• Mul­ti-Episode Style = “Extend­ed”
  Ex. Series_Title_2010.s01e01-02_Episode_Title