I have problems when using the multiple file selection of the upload control. There are two problems.

 

1) I'm having a problem with uploading a large amount of files through multiple file selection. All the checks would appear and then when I try to save all the files on the server,  I get the following error.

Exception Details: System.NullReferenceException: Object reference not set to an instance of an object.

The problem occurs when I select somewhere over 300 files (2MB png files)

 

2)Another problem is that occasionally multiple file selection is not enabled even though I explicitly enable it in the control. 

 

Any ideas?