Thanks for the information, OrsonJ.  I've made a Weaver account and am doing a small test transfer of SILK from Polo to Weaver, them from Weaver to Core.  Will update with results.

EDIT: am also getting up to 16% CPU usage on my 8-core i7, Win x64.

EDIT 2: Poloniex shows a complete withdrawal, including a txid.  Waiting a bit for it, but not looking promising...  Can't find an old block explorer to check up on it anyways.