This seems underdocumented in the image. How about

forgetModule: aString
	"Primitive. If the module named aString is loaded, unloaded. If not, 
and it is marked as unloadable, unmark it so the VM will try to load it 
again next time. See comment for #unloadModule:."
	<primitive: 571>
	^self primitiveFailed

in addition to or instead of unloadModule:?

Daniel

Andreas Raab wrote:
>> Smalltalk unloadModule: #MyPlugin
> 
> 
> Sigh. SmalltalkImage current unloadModule: #MyPlugin. Sigh.
> 
>   - A.
>