Hans, I didn't change the way the program is launched. [:(]
What I don't understand is whether your desktop icon is wrong or the program doesn't work anymore.
How many times did you try to launch the new beta?
Can you still launch the beta from the JNLP link?

I tested again the 6 arrows and they work in both modes.
The left, right, up and down navigation arrows have the same effect as the matching keys of the keyboard, whereas the two small up and down arrows at center have the same effect as the page up and page down keys.

I hope you'll be able to launch the program again.