Simple Key-Led design does not work

Hello aprado

Thank you for your help. It isreally frustrating ans as you say weird:)

I also tested with registering but no success:

module TestSwitch (clk, Switch, Led);   input clk;   input  Switch;  output  Led;   
reg  Keys;
@always @(Switch) Keys = Switch;
assign Led = (Keys | Keys); // does not work assign Led = Keys; // that works  end 

Both Leds and all keys are ok as i can control the leds by every key using statement e.g.:

assign Led[1] = Switch[1];

assign Led[1] = Switch[2];

assign Led[1] = Switch[3];

...

It seems that signal tap is not supported for this device.

Friendly regards

Andreas