[IronPython] SystemError: Object reference not set to an instance of an object

[Count László de Almásy]

i've been using IPY 2.6.1 with Mono 2.6.x for quite some time. Today I
upgraded one of my binary assemblies (libopenmetaverse) and suddenly
all my applications that use it are throwing this error:

Traceback (most recent call last):
SystemError: Object reference not set to an instance of an object

any idea what would cause this?

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Cheers, László