QIF importer crashes in gnucash-1.5.3

[Nigel Titley]

Attempting to import my (huge) Quicken QIF file gives me the following
error (about 88% into the import). It worked  with 1.4.10.

qif-parse:parse-acct-type : unhandled account type Invoice...
substituting Bank.qif-parse:parse-acct-type : unhandled account type
Invoice... substituting Bank./usr/share/gnucash/scm/main.scm:162:15: In
procedure gnc:start-ui-event-loop in expression
(gnc:start-ui-event-loop):
/usr/share/gnucash/scm/main.scm:162:15: Wrong type argument in position
3: "Parse ambiguity : between formats "

Gnucash then crashes. 

Any ideas?

Nigel