I'm using eblah 10.3.6. I've tried adding the IRC, EmbedMedia, Auto PM Popup, and Active User mods without success with any of them. I've uploaded the files using the correct modes.

With the IRC mod, I'm getting an error testing the installation at:

Source Code:

        </tr><tr>
         <td class="right"><strong>$admintxt2[335]</strong></td>
         <td><input type="checkbox" name="gattach" value="1"$gattach{1} /></td>

After:

        </tr><tr>
         <td class="right"><strong>Allow Guests to chat?</strong></td>
         <td><input type="checkbox" name="gchat" value="1"$gchat{1} /></td>

--» Code not found in source ...

With the EmbedMedia, shows Embed Media -- Uninstall | Test Uninstall | Edit | Remove, but there is no new "media" link when creating a post and manually using [media][/media] doesn't work in a post.

ActiveUsers -- Uninstall | Test Uninstall | Edit | Remove, doesn't appear to show any new info.

Auto PM Popup test install fails with -

Modify File: ./Code/Load.pl  (1 actions)
Source Code:

    onclick="target='_parent';">$memberid{$userid}{'sn'}</a>~;

         return(1);

Replace:

    onclick="target='_parent';">$memberid{$userid}{'sn'}</a>~;

    $memberid{$userid}{'pmpopup'} = 1;
         return(1);

--» Code not found in source ...

I'm stumped. The forum itself is working perfectly, but I cannot get a single mod working.

Strange... If you'd like me to take a look, PM me FTP details and an admin account. I'll see what's what.  

From all the mods you've installed, Only a couple show code not found in sections, that's normal, depending on what other mods have changed the code, version differences etc... Sometimes you'll have to do the mod anyway, then look for the "code not found" code manually in the source, when found, replace with the code the mod was going to replace it with.

For example. For the IRC chat mod, all code is fine except for

Code </tr><tr>      <td class="right"><strong>$admintxt2[335]</strong></td>      <td><input type="checkbox" name="gattach" value="1"$gattach{1} /></td>

is not found, so look in admin2.pl for the code manually, searching $gattach or admintxt2[335] or something.. Then manually replace with

Code </tr><tr>      <td class="right"><strong>Allow Guests to chat?</strong></td>      <td><input type="checkbox" name="gchat" value="1"$gchat{1} /></td>

then install the mod anyway, the code which is "not found" will be ignored and all other action will be carried out.
but that doesn't matter, because you've done the work it couldn't do yourself.

the autopm popup mod is a peice of cake..

Code Source Code:     onclick="target='_parent';">$memberid{$userid}{'sn'}</a>~;          return(1); Replace:     onclick="target='_parent';">$memberid{$userid}{'sn'}</a>~;     $memberid{$userid}{'pmpopup'} = 1;          return(1); --» Code not found in source ...

Just search load.pl for onclick="target='_parent';">$memberid{$userid}{'sn'}</a>~; and put   $memberid{$userid}{'pmpopup'} = 1; below it. don't even have to bother with the mod center...

Sometimes, subtle changes to code, whitespace, version changes or other mods can stop the mods finding the exact block of code character for character, including whitespace... If it's not perfect, it won't find it.

Everything seems quite normal. Let me know how you get on.

Awesome. Those worked perfectly. Thanks. I really appreciate it.