twe dumping broken again?

I'm getting the following error when trying to dump on a twe controller:

db> call doadump
Dumping 2047 MB (2 chunks)
  chunk 0: 1MB (154 pages) ... ok
  chunk 1: 2047MB (523968 pages) ... fail

** DUMP FAILED (ERROR 1) **
= 0x1d

This was working previously..is it my hardware or the driver at fault?

Kris