At the risk of stating the obvious, the isa() test failed as no Proc::Daemon object was returned by Proc::Daemon::Init() call, which in turn had failed, as OP found later (thanks for the update), while changing of user id.

ref test might have been added in 0.10 before eval{ isa() }. You may be using a version around there. (Somebody please give me a clue if it is possible to browse older versions code on MetaCPAN (as it is(or was?) possible on search.cpan).)

In reply to Re: Bizarre Proc::Daemon error by parv
in thread Bizarre Proc::Daemon error by xtpu2

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