Is it a problem of synchronisation, or problems regarding rising/falling edges of the 'clock'?

Perhaps both.

Please try the attached diagram.
The PWM timings are increased for better visualization in Simulator.
All edited parts are marked.

I'm trying to use a counter to switch between different values of a switch block (see attachment). I use kind of feedback to reset the counter as soon he reaches specific value. But it doesn't seem to work. I would like to adjust constant value '2' in the examples to walk trough index 0 and 1 of the switch, or to adjust to 5 to walk trough value 0,1,2,3,4. value from index '0' never come to output.
Is it a problem of synchronisation, or problems regarding rising/falling edges of the 'clock'?

Thanks

Nico