H.264 audi doesn't work how it's supposed to be anymore after a new Version

Hi there.

After a more recent update, can't really put my finger on it but my loading Screen of Media Encoder changed to this white Theme for example which i don't think i had before, the H.264 audio doesn't work like it's supposed to be anymore.

When i render my files in H.264 with the Media Encoder and just open them, everything seems to be fine, there's actual audio. However, as soon as i drag the rendered H.264 files into Movie Studio Platinum 13 it's only dragging in a Video Track and not a Video AND an Audio track together like it always was.

Here comes the really weird part : when i export audio only with H.264 through the Media Encoder and then drag that file into Movie Studio Platinum 13 it's showing the audio track perfectly fine. Just when i export Video and Audio together into one file throughout the Media Encoder Movie Studio Platinum is then only able to detect the Video Lane without the Audio Lane which i never had before. I hope someone can help me with this...

Cheers