No not running in a web farm. A single server handles all requests. I've send you a mail with details

Hi andybrummer, Try set the temp folder to a locatioin which not in the web farm environment, does it work? Preferably a fixed IP address. Regards, ken

We are getting nearly an identical problem.  Is this the case?  tgeorge73 - are you using a ~/directory or are you using //server/sharename?  I was wondering if it would behave differently if it realized we were using a network share in a web farm...

Hi mmbderksen,   Does it only happens on IE11? Does the site under load balancing/web farm environment? Can you deploy the demo on another pc to try again?   Regards,   Ken 

hi,   does your site under load balnacing/web farm environment? does it only happends with IE11?   Regards,   Ken 

We are considering your product for our community site.  How can it be configured to work in a server farm environment? We have multiple web servers (IIS) and a single database server (MS SQL).   Thank you.