Sorry to disturb you again but I'm facing a new problem which I can't seem to solve for myself:
Whenever I try to upload files on two (or more) different computers or browser sessions simultaneously, only the first finished upload is being processed correctly. The remaining upload sessions seem to be aborted (to be more specific: the files.length property is 0) exactly at the time, the files from the first session were processed.
I've already tried switching the UploadStateStoreProvider to inProc but then, the remaining upload sessions just stall (progress bar won't get refreshed and the process never finishes). When I choose the ASP.NET State Server instead of InProc state management, I get the following exception as soon as the (first) upload process finishes:
When looking at the event log, I've discovered that the worker process has been shut down after the first upload is finished (exactly at the time, my submit button handler is finished). I guess that's where my problem is :-(