I have searched faq and google but can't find any reference to this problem. I got into this situation by changing the refresh_pattern because all the cache entries were being reported as stale, when I did not think they were. Now my access log shows tcp_ims_hit, indicating (correctly) that the object is in squid cache, but the (cache disabled) browser displays a blank page and reports "done". When the object is genuinely stale it will be retrieved from the origin server and displayed in the browser.
John Sutherland Phone & Fax +61 2 4683 1511 9 Meryla Street, Couridjah NSW 2571 Australia