TIA Closing when trying to download to HMI

Hi

I have a problem when downloading to my HMI application to a TP1500. The 'TIA Prortal has encountered a problem and need to close' error will appear when I attempt to download.

I have attempted to do the following to resolve the problem:

-Re compiled/ Rebuilt project

-Try download from a different machine (I've used different VM's using Virutalbox and VMware and a 'real' machine)

-Imported code and graphics into another project. This downloaded correctly for 2 downloads. I then archived the project and tried to download from another (VM) machine which also worked. I then deleted/retrieved the project and the same error appeared again.

The project will open in simulation and I can open and download other projects to the TP1500.

Earlier archives of the project are now appearing with the error. They were working and downloading fine before this.

(Using TIA SP1 update 1)

Thank you

Think I have found out whats causing the problem

If I select 'Try all interfaces' from the 'connection to interface/subnet' field, select the device that is found when a search is completed and click load TIA will fail.

However if I select 'PN/IE' from the 'connection to interface/subnet' field and sselect the device that is found when a search is completed and click load TIA loads the HMI app correctly.

Any ideas whats causing this?