RPM,
It happened to me twice. Once I wound up getting paid the rest (although it took longer than a week - more like 2 months) and once I wound up not getting paid and the local went under. In any event, the is a MAJOR warning sign. I don't know about your situation, but a lot of times locals deal with clients who know each other and word would spread quickly that they aren't able to pay.
If you have other outs, I would suggest using them and tell your local that you will only use them once you get paid. When I wound up getting paid, the local later admitted to me that they were hoping that I would lose back what I was owed.
Sorry to hear about your situation.
Take Care,
Bart