Adobe Reader for Palm OS (Mac edition) synchronisation suddenly fails

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Yesterday I succesfully synced more than a hundred pdf files to my Treo
handheld. But today I suddenly get the following message:

Adobe Reader synchronization failed
'Adobe Reader' failed (error = Unknown Sync Error)

Anyone knows what goes wrong?

(OS X 10.3.9, Adobe Reader for Palm OS 3.05, Treo 650)


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