Lukas,

The version 23 (on SqueakSource) works fine on 3.8 (6665) (all tests
green, squeak and JS-side). Version 23 removes the dependency with
#withoutLeadingBlanks.

> > Load the version 20 (from SqueakSource) and it will work fine.
> 
> - MessageSend>>value: is missing in my 3.9 image, but I could add that.

It seems like a bug in Komanche. I see two possibilities: install
Seaside or implement:

MessageSend>>evaluateWithArguments:
	^ self valueWithArguments: anArray

MessageSend>>value:
	^ self evaluateWithArguments: (Array with: anObject)


> - Then I get in FireBug the error "S2SExampleTestCase is not defined"
> 
> - The test case #testMethodInstantiation fails in the Squeak TestRunner.

Which version of 3.9 are you using? I just installed ST2JS (after
DynamicBindings, KomServices and KomHttpServer) in a virgin 3.9 (7045)
and works fine for me (green both sides).

Cheers,

-- Diego