did you install it for p12 - or for a different version of Poser? Have you checked the poserStartup.py script ?

you will find a couple of lines in there which say :

_loadAddons(runtimeRoot)
for runtimePath in poser.Libraries():
    _loadAddons(runtimePath)

try editing them to read :

_loadAddons(runtimeRoot)
for runtimePath in poser.Libraries():
    if not "dson" in runtimePath:
        _loadAddons(runtimePath)

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