Windows App Certification Kit hangs

I ran into this exact same issue:

"Direct3D trim after suspend In progress... UTF-8 file encoding In progress..."

Problem was that I didn't try to run the Release Version locally first. It didn't run because I used preprocessor directives like so:

public static LicenseInformation licenseInformation = null;

...

#if DEBUG
        ...
        ...
        licenseInformation = CurrentAppSimulator.LicenseInformation;
#else
        licenseInformation = CurrentApp.LicenseInformation;
#endif

"CurrentApp" did cause an exception.. I use code like this now:

#if DEBUG
        ...
        ...
        licenseInformation = CurrentAppSimulator.LicenseInformation;
#else
        try
        {
            licenseInformation = CurrentApp.LicenseInformation;
        }
        catch (Exception)
        {
        } 
#endif

And when working with the licenseInformation somewhere I check if it is not null before I use it...

I also found some other issues (warnings) in my code by using "Run Code Analysis on Solution"..

So in my case it was a problem with my code.