I am trying to root my HTC One S following the instructions on HTCDev

I generated an Unlock_code and everything works well until Step 13. In Step 12, I typed

fastboot flash unlocktoken Unlock_code.bin 

in cmd which returned the expected result of:

...\Android\android-sdk\platform-tools>fastboot flash unlocktoken Unlock_code.bin
sending 'unlocktoken' (0 KB)...
OKAY [  0.148s]
writing 'unlocktoken'...
(bootloader) unlock token check successfully
OKAY [  0.016s]
finished. total time: 0.171s

According to HTCDev, I sould now see a disclaimer, but my smartphone remains in the Fastboot USB menue.

I've read that it is recommended to have HTC Synch Manager installed in order to connect to a PC. However, Synch Manager does not start correctly and returns the following errormessage:

Runtime Error!
...
This application has requested the Runtime to terminate in an unusual way. 
Please contact the application's support team for more information.

On the other hand, my smartphone should be connected to my pc since I can see it in cmd

\platform-tools>fastboot devices
SH23XW403779    fastboot

Any ideas? Thanks