Hi!
I have SDL Studio 2015 working on Windows 10. 
One of my customers usually sends a .stppk package that includes dozens of languages, from western to asiatic, usually more than 20. 
With Studio 11 and before Windows 10 I always managed to open the package; would pick just my language and then would work on it, returning the individual sdlxliff file. 
After SDL 2015 and Windows 10, whenever I try to open such a package I always get all the normal messages while it is trying to open:

Preparing package for import
Adding files
Converting files to sdlxliff format
Updating word count
Calculating translation progress
Processing translation progress

and then, the last one: 
Object reference not set to an instance of an object

and it stops there... I never manage to go into any other view or do anything else. It just stays there with that window open and I have to cancel and withdraw. I never even manage to see the files.

Is there a solution for this problem or, at least, an idea of what is causing it? I never had problems with previous versions of SDL.

Thank you for your help.