I have a similar issue when i try to upload multiple files from ie8 to iis7 I'm using the last CuteWebUI.AjaxUploader.dll     Randomly the upload freeze     and after some minutes i receive this error:     How can i fix this problem?   I have found a workaroud from ...

(Similar posting on diffent thread) I'm having a similar issue... maybe check out my website using IE8... its basically the ''Start uploading manually'' scenario, but the OnPostBack javascript doesnt seem to get called.http://www.mailpro.org/Anon_Upload.aspx theres a temporary source viewer ...

(Not to add noise) but there seems to be an issue with IE8, FYI.  I'm getting similar (but client-side) oddities.  My CuteWebUI_AjaxUploader_OnPostBack javascript sometimes doesnt get called...