ASN.1 dissector non-functional?

["RUOFF, LARS (LARS)** CTR **" <lars.ruoff () alcatel-lucent com>]

Hi,

in Wireshark 1.6.1, i'm unable to "Decode As ..." ASN.1
It works in Ethereal 0.10.5 (yes, i know, that's old) for the same trace file.
Anybody knows why and when the ASN1 dissector got dysfunctional?
Am i missing some preference settings?
Does anybody have an example of a functional ASN1 dissection with the current release?

regards,
Lars R.
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