the below is what is in the "view selection source" box that appears:
<tr class="pl-video yt-uix-tile " data-title="Lars Andersen Archery - Is it Real?" data-set-video-id="" data-video-id="IU4PSENakKw"><td class="pl-video-handle "></td><td class="pl-video-index"></td><td class="pl-video-thumbnail"><span class="pl-video-thumb ux-thumb-wrap contains-addto"><a href="/watch?v=IU4PSENakKw&index=1&list=LLJZ94qp4dtCw0Q5UQqAkg7w" class="yt-uix-sessionlink" aria-hidden="true" data-sessionlink="feature=plpp_video&ved=CBYQxjQ&ei=MnYyVeXuJZGT4gKGuICoBw"> <span class="video-thumb yt-thumb yt-thumb-72">
<span class="yt-thumb-default">
<span class="yt-thumb-clip">
<img alt="" aria-hidden="true" src="//
i.ytimg.com/vi/IU4PSENakKw/default.jpg" width="72">
<span class="vertical-align"></span>
</span>
</span>
</span>
</a> <span class="thumb-menu dark-overflow-action-menu video-actions">
<button aria-haspopup="true" onclick=";return false;" class="yt-uix-button-reverse flip addto-watch-queue-menu spf-nolink hide-until-delayloaded yt-uix-button yt-uix-button-dark-overflow-action-menu yt-uix-button-size-default yt-uix-button-has-icon no-icon-markup yt-uix-button-empty" type="button" aria-expanded="false"><span class="yt-uix-button-arrow yt-sprite"></span><ul class="watch-queue-thumb-menu yt-uix-button-menu yt-uix-button-menu-dark-overflow-action-menu hid"><li role="menuitem" class="overflow-menu-choice addto-watch-queue-menu-choice addto-watch-queue-play-next yt-uix-button-menu-item" data-action="play-next" onclick=";return false;" data-video-ids="IU4PSENakKw"><span class="addto-watch-queue-menu-text">Play next</span></li><li role="menuitem" class="overflow-menu-choice addto-watch-queue-menu-choice addto-watch-queue-play-now yt-uix-button-menu-item" data-action="play-now" onclick=";return false;" data-video-ids="IU4PSENakKw"><span class="addto-watch-queue-menu-text">Play now</span></li></ul></button>
</span>
<button data-tooltip-text="Watch Later" class="yt-uix-button yt-uix-button-size-small yt-uix-button-default yt-uix-button-empty yt-uix-button-has-icon no-icon-markup addto-button video-actions spf-nolink hide-until-delayloaded addto-watch-later-button yt-uix-tooltip" type="button" onclick=";return false;" title="Watch Later" role="button" data-video-ids="IU4PSENakKw"></button>
<button class="yt-uix-button yt-uix-button-size-small yt-uix-button-default yt-uix-button-empty yt-uix-button-has-icon no-icon-markup addto-button addto-queue-button video-actions spf-nolink hide-until-delayloaded addto-tv-queue-button yt-uix-tooltip" type="button" onclick=";return false;" title="TV Queue" data-style="tv-queue" data-video-ids="IU4PSENakKw"></button>
</span></td> <td class="pl-video-title">
<a class="pl-video-title-link yt-uix-tile-link yt-uix-sessionlink spf-link " dir="ltr" href="/watch?v=IU4PSENakKw&index=1&list=LLJZ94qp4dtCw0Q5UQqAkg7w" data-sessionlink="feature=plpp_video&ved=CBYQxjQ&ei=MnYyVeXuJZGT4gKGuICoBw">
Lars Andersen Archery - Is it Real?
</a>
<div class="pl-video-owner">
by <a href="/user/TSOAS2008" class=" yt-uix-sessionlink spf-link g-hovercard" data-sessionlink="feature=playlist&ved=CBYQxjQ&ei=MnYyVeXuJZGT4gKGuICoBw" data-ytid="UCkRwb4iXDfw-6FEgqkCQqUQ" data-name="playlist">Antony Cummins</a>
</div>
</td>
<td class="pl-video-badges"></td><td class="pl-video-added-by"></td><td class="pl-video-time"><div class="more-menu-wrapper"> <div class="timestamp"><span title="19 minutes">19:54</span></div>
<div class="pl-video-edit-options"></div></div></td></tr>
The thing i noticed that seems to be what i have trouble with is that links on the side of the screen (such as related videos) or videos you find from searching the channel with have a link that looks like "watch?v=gfhjs44gh" (for example). Whereas the links i am highlighting in playlists have that, but also have &index=1&list=fdhjfdk3k4k after it (again, just made up examples). I have no idea why that works for you, but not for me, but thats the only thing i noticed that stands out as being different to searching (which is working)