Bug vBquizz menu showed two time

Hi,
since the upgrade to the pro version we have two time the menu showed in the navbar.
We have the vBNavTab mod from this site and use it, so we have one on the first navbar and one on the second.
How can i solve this problem ?
Regards,

Sounds like you have both the navigation manager entries and automatic dropdown. Disable the plugin Navigation Button 4.2 under the quiz section in the ACP

thank you, it solve the problem