Fixed it! See how:

https://git.purrdata.net/jwilkes/purr-data/issues/274#note_2447

@jancsika I get:
print: symbol /Applications/Pd-l2ork.app/Contents/Resources/app.nw/extra

Which seems OK? But why is the list not populating.
The only thing I did between running Purr-data the first time and the other times, was reinstalling the Xcode dev tools with xcode-select --install... could that have had any influence? I did try and reinstall Purr-data after that though.

@jancsika the contents of that file (org.puredata.pd-l2ork.default.plist are as follows.... if I had to guess, <string>-helppath ~/Library/Pd -helppath /Library/Pd</string> should be something like Pd-l2ork/Contents/Resources/app.nw/extra instead of ~/Library/Pd ?

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE plist PUBLIC "-//Apple Computer//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
<plist version="1.0">
<dict>
<key>defeatrt</key>
<string>0</string>
<key>flags</key>
<string>-helppath ~/Library/Pd -helppath /Library/Pd</string>
<key>loadlib1</key>
<string>libdir</string>
<key>loadlib2</key>
<string>Gem</string>
<key>loadlib3</key>
<string>cyclone</string>
<key>loadlib4</key>
<string>zexy</string>
<key>loadlib5</key>
<string>creb</string>
<key>loadlib6</key>
<string>cxc</string>
<key>loadlib7</key>
<string>iemlib</string>
<key>loadlib8</key>
<string>list-abs</string>
<key>loadlib9</key>
<string>mapping</string>
<key>loadlib10</key>
<string>markex</string>
<key>loadlib11</key>
<string>maxlib</string>
<key>loadlib12</key>
<string>memento</string>
<key>loadlib13</key>
<string>mjlib</string>
<key>loadlib14</key>
<string>motex</string>
<key>loadlib15</key>
<string>oscx</string>
<key>loadlib16</key>
<string>pddp</string>
<key>loadlib17</key>
<string>pdogg</string>
<key>loadlib18</key>
<string>pixeltango</string>
<key>loadlib19</key>
<string>pmpd</string>
<key>loadlib20</key>
<string>rradical</string>
<key>loadlib21</key>
<string>sigpack</string>
<key>loadlib22</key>
<string>smlib</string>
<key>loadlib23</key>
<string>unauthorized</string>
<key>loadlib24</key>
<string>vbap</string>
<key>loadlib25</key>
<string>pan</string>
<key>loadlib26</key>
<string>hcs</string>
<key>loadlib27</key>
<string>jmmmp</string>
<key>loadlib28</key>
<string>ext13</string>
<key>loadlib29</key>
<string>ggee</string>
<key>loadlib30</key>
<string>iem_anything</string>
<key>loadlib31</key>
<string>ekext</string>
<key>loadlib32</key>
<string>pdp</string>
<key>loadlib33</key>
<string>disis</string>
<key>loadlib34</key>
<string>lyonpotpourri</string>
<key>nloadlib</key>
<string>34</string>
<key>path1</key>
<string>/System/Library/Fonts</string>
<key>path2</key>
<string>/Library/Fonts</string>
<key>path3</key>
<string>~/Library/Fonts</string>
<key>path4</key>
<string>/usr/X11R6/lib/X11/fonts/TTF</string>
<key>path5</key>
<string>/System/Library/Frameworks/JavaVM.framework/Versions/1.5.0/Home/lib/fonts</string>
<key>npath</key>
<string>5</string>
</dict>

</plist>

There's nothing in them... should they be populated?

@jancsika the output is:

Welcome to Pd GUI using Node-Webkit
0.18.4
font stack check: using optimal font sizes.
GUI is starting Pd...
GUI listening on port 5400 on host 127.0.0.1
gui_path is /Applications/Pd-l2ork.app/Contents/Resources/app.nw
binary is /Applications/Pd-l2ork.app/Contents/Resources/app.nw/bin/pd-l2ork
Pd started.
incoming connection to GUI
canvasinfo: v0.1
stable canvasinfo methods: args dir dirty editmode vis
pdinfo: v.0.1
stable pdinfo methods: dir dsp version
classinfo: v.0.1
stable classinfo methods: size
objectinfo: v.0.1
stable objectinfo methods: class
[import] $Revision: 1.2 $
[import] is still in development, the interface could change!
compiled against Pd-l2ork version 2.0 (20170207-rev.a243cb3)
working directory is /Users/markijzerman

Hi all,

I'm running the latest Purr-data version on OSX 10.12... and it doesn't seem to load the included libraries.
For example, the shell object, or mavg, dsp etc. should be included but are not being loaded.
The first time I started Purr-data, they were. But now, no matter if I reinstall it or whatever, they are not being found.

If I open help files of these externals from within the application (so Pd-l2ork/Contents/Resources/app.nw/extra/pddp/dsp-help.pd for example, the abstraction dsp.pd loads just fine.

What's going on?