vault and .net framework 4.5

I am able to successfully implement vault in a asp.net 2.0 project, but cannot get vault to work in a asp.net 4.5 project. Is it possible to run vault under asp.net 4.5?

Add file appears to work, but on clicking upload the progress bars spins, but image is not uploaded and an error never occurs.

I am using vault 1.6.

Have you already download v.2.0?
Is this issue arises again in this version?