Mac & Treo 600 not synching

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OS 10.4.7 on a G4 500 Sawtooth.
All was well until I upgraded from Panther to Tiger. The Treo can no
longer establish a connectinon when attempting to sync.

Specifially: Treo shows an alert; Mac shows no activity.

Have installed/updated Palm desktop.
Transport Monitor and Palm Desktop Background load on log in.
Am considering Missing Synch but it requires (recommends) me to b/u first
... which I currently cannot do.
I've obviously not exhausted the various sources of info out there, but
has any one encountered  - and resolved - this problem?

Non Illegitimi Carborundum

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