from this post http://drupal.org/node/354445 I got the impression that this problem was due to Imagefield and that it had been resolved. I apologise if I have misread/misunderstood.
However, I am still suffering the problem that HS becomes disabled following a file upload. I have tried disabling the Imagefield Module but that doesnt help. It doesnt seem to matter what type of file I upload either (.doc, .gif, .html).
I am using D6.11, Filefield 6.x-3.0 and Imagefield 6.x-3.0.