could you provide the full (related) output of the Pd-console, when it
tries (and fails) to load the i386 binary?

------------------ done with main ----------------------
connection from 'pd' to 'pd-gui' on 127.0.0.1:64688
Tk 8.5.19
detected font: DejaVu Sans Mono
using font: Menlo normal
Loading plugin: /Applications/Pd-0.52-2-i386.app/Contents/Resources/Scripts/pd_deken.tcl
[deken] Platform detected: Darwin-x86_64-float32
Loading plugin: /Applications/Pd-0.52-2-i386.app/Contents/Resources/Scripts/pd_docsdir.tcl
Pd documents directory: /Users/porres/Documents/Pd
[deken] Platform re-detected: Darwin-i386-float32
tried ./else.d_fat and failed
tried ./else.d_i386 and failed
tried ./else.pd_darwin and failed
tried ./else.so and failed
tried ./else/else.d_fat and failed
tried ./else/else.d_i386 and failed
tried ./else/else.pd_darwin and failed
tried ./else/else.so and failed
tried ./else.pd and failed
tried ./else.pat and failed
tried ./else/else.pd and failed
tried /Users/porres/Documents/Pd/externals/else.d_fat and failed
tried /Users/porres/Documents/Pd/externals/else.d_i386 and failed
tried /Users/porres/Documents/Pd/externals/else.pd_darwin and failed
tried /Users/porres/Documents/Pd/externals/else.so and failed
tried /Users/porres/Documents/Pd/externals/else/else.d_fat and succeeded
/Users/porres/Documents/Pd/externals/else/else.d_fat: dlopen(/Users/porres/Documents/Pd/externals/else/else.d_fat, 10): no suitable image found.  Did find:
/Users/porres/Documents/Pd/externals/else/else.d_fat: no matching architecture in universal wrapper
/Users/porres/Documents/Pd/externals/else/else.d_fat: no matching architecture in universal wrapper
... you might be able to track this down from the Find menu.
tried /Users/porres/Documents/Pd/externals/else.pd and failed
tried /Users/porres/Documents/Pd/externals/else.pat and failed
tried /Users/porres/Documents/Pd/externals/else/else.pd and failed
tried /Users/porres/Documents/Pd/externals/else/else.d_fat and succeeded
/Users/porres/Documents/Pd/externals/else/else.d_fat: dlopen(/Users/porres/Documents/Pd/externals/else/else.d_fat, 10): no suitable image found.  Did find:
/Users/porres/Documents/Pd/externals/else/else.d_fat: no matching architecture in universal wrapper
/Users/porres/Documents/Pd/externals/else/else.d_fat: no matching architecture in universal wrapper
tried /Users/porres/Documents/Pd/externals/else/else.pd and failed
tried /Users/porres/Documents/Pd/externals/else/else.pat and failed
tried /Users/porres/Documents/Pd/externals/else/else/else.pd and failed
tried /Users/porres/Library/Pd/else.d_fat and failed
tried /Users/porres/Library/Pd/else.d_i386 and failed
tried /Users/porres/Library/Pd/else.pd_darwin and failed
tried /Users/porres/Library/Pd/else.so and failed
tried /Users/porres/Library/Pd/else/else.d_fat and failed
tried /Users/porres/Library/Pd/else/else.d_i386 and failed
tried /Users/porres/Library/Pd/else/else.pd_darwin and failed
tried /Users/porres/Library/Pd/else/else.so and failed
tried /Users/porres/Library/Pd/else.pd and failed
tried /Users/porres/Library/Pd/else.pat and failed
tried /Users/porres/Library/Pd/else/else.pd and failed
tried /Library/Pd/else.d_fat and failed
tried /Library/Pd/else.d_i386 and failed
tried /Library/Pd/else.pd_darwin and failed
tried /Library/Pd/else.so and failed
tried /Library/Pd/else/else.d_fat and failed
tried /Library/Pd/else/else.d_i386 and failed
tried /Library/Pd/else/else.pd_darwin and failed
tried /Library/Pd/else/else.so and failed
tried /Library/Pd/else.pd and failed
tried /Library/Pd/else.pat and failed
tried /Library/Pd/else/else.pd and failed
tried /Applications/Pd-0.52-2-i386.app/Contents/Resources/Scripts/../extra/else.d_fat and failed
tried /Applications/Pd-0.52-2-i386.app/Contents/Resources/Scripts/../extra/else.d_i386 and failed
tried /Applications/Pd-0.52-2-i386.app/Contents/Resources/Scripts/../extra/else.pd_darwin and failed
tried /Applications/Pd-0.52-2-i386.app/Contents/Resources/Scripts/../extra/else.so and failed
tried /Applications/Pd-0.52-2-i386.app/Contents/Resources/Scripts/../extra/else/else.d_fat and failed
tried /Applications/Pd-0.52-2-i386.app/Contents/Resources/Scripts/../extra/else/else.d_i386 and failed
tried /Applications/Pd-0.52-2-i386.app/Contents/Resources/Scripts/../extra/else/else.pd_darwin and failed
tried /Applications/Pd-0.52-2-i386.app/Contents/Resources/Scripts/../extra/else/else.so and failed
tried /Applications/Pd-0.52-2-i386.app/Contents/Resources/Scripts/../extra/else.pd and failed
tried /Applications/Pd-0.52-2-i386.app/Contents/Resources/Scripts/../extra/else.pat and failed
tried /Applications/Pd-0.52-2-i386.app/Contents/Resources/Scripts/../extra/else/else.pd and failed
else: can't load library