According to http://wiki.fluidproject.org/display/fluid/Uploader+QA+Test+Plan, Test 15: "While a file is uploading, the 'x' (remove), 'Upload', and 'Add More' buttons should be disabled"
I uploaded several files, and clicked "Upload". During the upload, I tabbed into the item list and started pressing "Delete" on my keyboard until all files are removed. I have attached a screenshot.
I have reproduced this on IE7, FF3.6.8.
I have also reproduced this on the demo site (http://build.fluidproject.org/infusion/demos/uploader/demo.html), and the infusion-1.1.3-src-rewriteHead.
Here is the Firefox error report:
Error: file is undefined
Source File: http://build.fluidproject.org/infusion/components/uploader/js/DemoUploadManager.js
Here is the IE7 error report:
Error Message: 'file.id' is null or not an object