Lpc2000

I've two Philips LPC designs.  One uses a LPC2294 and the other a 
LPC2194.  I've been working on the LPC2294 design for some time and 
have not had any problems at all.  My LPC2194 design is a different 
story.  I'm using the Keil DKARM (V1.4) and ULINK to program the 
LPC's via JTAG.  My LPC2194's program the 1st time but from then on 
out I get an error saying:

"JTAG Communication Failure", "Error: Flash download failed - Target 
DLL has been canceled".

I've stuck on 3 other LPC2194's and each has failed in the same way.

I have the proper crystal freq. selected in the target settings 
(12Mhz).  I have "ULINK ARM Debugger" selected in the "Use target 
driver for flash programming" field, and I have "LPC2000 IAP 256KB 
Flash" selected for the programming algorithm.

Like I said, I use the same setting above for a LPC2294 and it works 
fine every time.  The parts that fail to program a second time run 
their initially flashed program just fine, I just can't get at the 
JTAG port.

I've searched the threads here and the LPC2194 errata and see there 
are some programming problems with devices with early date codes.  
But that problems seems to be a lockup during programming, not what 
I'm seeing.  I've contacted Keils support vie email, I thought I'd 
try here also to see if anyone else has seen this...

Any ideals, I'm stumped?