Seems not so Fixed for me - my little forum

Replacing the 5 files then brings up a http 500 error, site becomes unreachable.

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Another Bug in 2.3.7? Avatars - Magma, 2016-11-24, 18:44
- Another Bug in 2.3.7? Avatars - Micha, 2016-11-24, 19:39
  - Another Bug in 2.3.7? Avatars - Magma, 2016-11-24, 19:54
    - Another Bug in 2.3.7? Avatars - Magma, 2016-11-24, 20:03
      - Another Bug in 2.3.7? Avatars - Micha, 2016-11-24, 20:07
        
        Another Bug in 2.3.7? Avatars - Magma, 2016-11-24, 20:18
        
        Another Bug in 2.3.7? Avatars - Micha, 2016-11-24, 20:33
        
        Another Bug in 2.3.7? Avatars - Magma, 2016-11-24, 21:37
        
        Another Bug in 2.3.7? Avatars - Micha, 2016-11-25, 09:50
        
        Another Bug in 2.3.7? Avatars - Auge, 2016-11-25, 14:27
        
        Another Bug in 2.3.7? Avatars - Magma, 2016-11-25, 15:02
        
        Another Bug in 2.3.7? Avatars - Auge, 2016-11-25, 15:29
        
        Another Bug in 2.3.7? Avatars - Magma, 2016-11-25, 17:40
        
        Another Bug in 2.3.7? Avatars - Micha, 2016-11-26, 10:26
        
        Another Bug in 2.3.7? Avatars - Magma, 2016-11-26, 11:52
        
        Another Bug in 2.3.7? Avatars - Magma, 2016-11-26, 12:02
        
        Another Bug in 2.3.7? Avatars - Micha, 2016-11-26, 13:44
        
        Another Bug in 2.3.7? Avatars - Magma, 2016-11-26, 14:04
        
        Another Bug in 2.3.7? Avatars - Micha, 2016-11-26, 14:15
        
        Another Bug in 2.3.7? Avatars - Magma, 2016-11-26, 14:43
        
        Another Bug in 2.3.7? Avatars - Micha, 2016-11-26, 14:52
        
        Another Bug in 2.3.7? Avatars - Magma, 2016-11-26, 15:04
        
        Another Bug in 2.3.7? Avatars - Micha, 2016-11-26, 15:15
        
        Another Bug in 2.3.7? Avatars - Magma, 2016-11-26, 16:24
        
        Another Bug in 2.3.7? Avatars - Micha, 2016-11-26, 16:48
        
        Another Bug in 2.3.7? Avatars - Magma, 2016-11-26, 19:24
        
        Another Bug in 2.3.7? Avatars - Micha, 2016-11-26, 21:59
- Another Bug in 2.3.7? Avatars - Micha, 2016-11-27, 13:27
  - Seems Fixed - Magma, 2016-11-27, 18:19
    - Seems Fixed - Micha, 2016-11-27, 18:56
      - Seems Fixed - Micha, 2016-11-27, 23:33
        
        Seems not so Fixed for me - Magma, 2016-11-28, 10:52
        
        Seems not so Fixed for me - Micha, 2016-11-28, 14:23
        
        Step by step introduction - Micha, 2016-11-28, 17:20
        
        Step by step introduction, still failed - Magma, 2016-11-28, 19:51
        
        Step by step introduction, still failed - Micha, 2016-11-28, 22:12
        
        Step by step introduction, still failed - Micha, 2016-11-28, 23:00
        
        Step by step introduction, still failed - Magma, 2016-11-29, 01:11
        
        Step by step introduction, still failed - Micha, 2016-11-29, 08:59
        
        Test file with getAvatar-Function - Micha, 2016-11-29, 18:27
        
        Test file with getAvatar-Function - Magma, 2016-11-29, 22:44
        
        Test file with getAvatar-Function - Micha, 2016-11-30, 08:40
        
        I think it's fixed now - Magma, 2016-11-30, 15:05
        
        I think it's fixed now - Micha, 2016-11-30, 16:16
        
        I think it's fixed now - Magma, 2016-12-01, 14:13