Need network troubleshooting help

Running this some more, I hit:

ASSERT((!jsvGetNextSibling(var) && !jsvGetPrevSibling(var)) || jsvIsRefUsedForData(var) || (jsvIsName(var) && (jsvGetNextSibling(var)==jsvGetPrevSibli­ng(var)))) FAILED AT src/jsvar.c:402
  #1[r3,l2] Object {
    #2[r1,l2] ASSERT((!jsvGetNextSibling(var) && !jsvGetPrevSibling(var)) || jsvIsRefUsedForData(var) || (jsvIsName(var) && (jsvGetNextSibling(var)==jsvGetPrevSibli­ng(var)))) FAILED AT src/jsvar.c:402

It does smell like some JSvars corruption... If you have any hints on what to look for, that might help me a lot tracking it down!

Mhh, I have the sneaky feeling that the answer is going to be "you must be unlocking something that is still used afterwards"... If that's the case, how to best troubleshoot it?