I'm having issues with the subtitles for Nanoha episode 10. They only appear occasionally and when they appear they don't appear properly. The other episodes play fine and I've downloaded episode 10 several times from different sources. I'm using ZoomPlayer with the latest CCCP filter pack.

Any fixes?

Just for clarification are you talking about episode 10 of the first season or A's? I'll take a look at how they've been muxed but it's very strange that only one episode out of either season would give you that problem.

Anyone else had the same problem with only one ep?

actually i have a similar case and its episode 10 of the 1st season. for some reason i don't see any subtitle at all and directVobSub does not detect any subtitle from that particular file. i downloaded from the batch torrent "# Magical Girl Lyrical Nanoha Season 1 29-OCT-06"

EP10 of Season1 DVD encodes were just fine for me, i am using CCCP+Coreavc+MPC

I have this problem for ep10 season 1 as well. Using CCCP I've tested with MPC as well as ZPlayer, neither display any subtitles at all.

Does anyone have a method to troubleshoot this?
Here's the the filters popup from my MPC which does play it correctly.

I suppose we can try CCCP Insurgent's Test Render. Here's the output of my working copy (though the video decoder is obviously wrong since MPC uses coreavc)

File: E:\Anime\[DGz] Magical Girl Lyrical Nanoha\[DGz]Magical Girl Lyrical Nanoha\Magical Girl Lyrical Nanoha - 10.DVD[H264.AAC][DGz][520E6F18].mkv

Filter 0: Default DirectSound Device
Filename: C:\WINDOWS\system32\quartz.dll
Filter CRC: EF5A266F
Date: 2005-08-29 | 22:54:26
Filter 1: Video Renderer
Filename: C:\WINDOWS\system32\quartz.dll
Filter CRC: EF5A266F
Date: 2005-08-29 | 22:54:26
Filter 2: ffdshow Audio Decoder
Filename: C:\Program Files\Combined Community Codec Pack\Filters\ffdshow.ax
Filter CRC: AB9AB0B6
Date: 2006-12-11 | 16:54:52
Filter 3: DirectVobSub (auto-loading version)
Filename: C:\Program Files\Combined Community Codec Pack\Filters\VSFilter.dll
Filter CRC: 25BFDE87
Date: 2005-11-25 | 15:58:18
Filter 4: CyberLink H.264/AVC Decoder (PDVD7.x)
Filename: C:\Program Files\CyberLink\PowerDVD\VideoFilter\CL264dec.ax
Filter CRC: 6BCCDDE0
Date: 2007-02-07 | 23:54:30
Filter 5: E:\Anime\[DGz] Magical Girl Lyrical Nanoha\[DGz]Magical Girl Lyrical Nanoha\Magical Girl Lyrical Nanoha - 10.DVD[H264.AAC][DGz]
Filename: C:\Program Files\Combined Community Codec Pack\Filters\splitter.ax
Filter CRC: C0C907F8
Date: 2006-07-07 | 14:32:24

Upon further investigation, the video track was mistakenly placed 3rd in the mkv after the audio and subtitle tracks. In a couple other eps the track order is 1) Video, 2) Audio, 3) Subs and ep 10 is 1) Audio, 2) Subs, 3) Video.

Why the issue is affecting only a very small number of systems is beyond me, but you can fix it in three ways:
1) Download the script from the link below and load it separately
2) Demux and remux the mkv, putting the tracks in the right order
3) Figure out which part of the playback process is failing at fixing this simple flub. I'll take a shot in the dark and guess it is either Haali's Media Splitter or VSFilter. Make sure you have the latest versions of each.

Placing this script file in the same directory as the mkv should cause it to be autoloaded (at least in MPC it will).
http://www.damagedgoodz.net/misc/Magical%20Girl%20Lyrical%20Nanoha%20-%2010.DVD%5BH264.AAC%5D%5BDGz%5D%5B520E6F18%5D.ass