Content originally posted in LPCWare by lpcxpresso-support on Wed Apr 16 09:13:52 MST 2014
The purpose of the "Vector catch" setting is to force the part through additional reset processing prior to connect. If this worked for you, I suspect there's a separate issue. In some cases, this has been traced to incorrect power, and/or clock (e.g. PLL) settings. If this were the case, booting the part into the ISP should have resolved it. Glad to hear you've resolved the problem.
Regards,
LPCXpresso-Support