I have been getting a problem completing online forms on a number of
JSP powered sites. I complete the details as requested, but on
submission I am prompted to complete an essential field and re-submit.
However, the field I am being asked for has already been completed.

Sites where I have experienced this problem are nectar.com (register
online), boots.com (apply for Advantage card) and the UK government
site to claim child benefit (from
http://www.inlandrevenue.gov.uk/chil...m#howdoiclaim).

I get the problem both with IE and Netscape so not browser-specific.

I am able to use other (non-JSP) forms, eg Google Groups and Hotmail
without problem.

Any advice much appreciated.