I was using the usls http://sw.opencyc.org/services/ocEntries and http://sw.opencyc.org/services/resources/ocConceptStrings
with "max" and "probe" parameters to search for resources. It has suddenly stopped working. Any Idea
That's not really a public API, and should not be relied on.
There is a suite of official OpenCyc Web Services at http://ws.opencyc.org/ (note that's "ws" not "sw"). Perhaps those will suit your needs.