Found my error, it was the external sound card.
Only Prolux itself isn't receiving timecode? the Web cliënt of the cuecore shows me the correct time...
Bug to solve?
For the ones who wants to know how i did it:
I made a SMPTE recording in Cubase, the track has a duration of 30 minutes as i forgot to stop it after dinner
But, i can keep it and shorten it to my desired length for my lightshow.
I play 2 songs at the same time with Virtual DJ. I use an external sound card for output to speakers, and the internal headphone conntection on deck 4, with the timecode track. I start the tracks with a keyboard shortcut.
I have an Mini-jack to XLR (some plugs between them) from my laptop's headphone output to the SMPTE XLR connector on the Cuecore.
Works fine!
Hope you can fix it soon
Thank you!