Hi MihaiB,

Yes, for load balancing environment, you need to set the TempDirectory to a a central location, then it will work. 

Setting temporary file location in web.config

Add an entry into the <appSettings> section of your application web.config file:

<add key="CuteWebUI.AjaxUploader.TempDirectory" value="~/UploaderTemp"/>

In web farm environments, the Url that you specify must map to a central location, which is saved to by all servers in the farm. This can be done using a virtual directory that maps to a common shared folder on the network.

<add key="CuteWebUI.AjaxUploader.TempDirectory" value="\\shareserver\temp"/>

Regards,

Ken