@Fredo6 I don’t know if it’s known issue but I can’t create custom V-Ray toolbars, I was able to do it with toolbar editor but the developer doesn´t develops it anymore or answers any messages or mails, I really hope he´s fine and just decided to quit the development. @DanRathbun created a file to replace the .rb file and make it work, but every now and then all the toolbars I created just disappear and have to create them again, I went back to LOTT because I saw a video and found out that it’s possible to create dockable toolbars and not just the floating ones that really annoyed me.
As far as I can remember, it’s a well known issue and LOTT can’t create custom toolbars for Vray commands.
Maybe it’s possible to upgrade Toolbar Editor for that.
Since VRay 6, Chaos Group prevents scripts to include their icons to execute from a custom toolbar.
In the Default Parameters, there is a parameter to enable / disable VRay. You may want to try, just in case.