Hello Tolga,
I tried what you told me but it still didn't work. I waited for 15 mins but nothing appeared on the front panel. I even checked with the nagvigation window to make sure the controls aren't pasted somewhere far away from the current view. There's really nothing on the front panel.
Could it be the problem of my computer? It's pretty old.
Anyway, thank you very much for your help. And could you send me the "fixed" vi (GUI Core.vi)?
I strongly suggest that NI should issue update patches for at least a year or so after the purchase of the sofware. It could actually save you guys a lot of time if simply updating the software fixes the problem.
TK Lui