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If menu item can be invisible at one time it is remove
from list of components and would never be avalable.

Code from VelocityMenuDisplayer

MenuComponent[] components = menu.getMenuComponents();

for (int i = 0; i < components.length; i++) {
if (isAllowed(components[i])) {
componentsAllowed.add(components[i]);
}
}

menu.getComponents().clear();
menu.getComponents().addAll(componentsAllowed);

Onse this done not Allowed Items will disapper forever.

Followups:

Date: 2005-11-16 09:51
Sender: y-hosaka
Logged In: YES
user_id=1379015

I wrote a patch for using VelocityMenuDisplayer and
PermissionsAdapter.(cf.: Patches[1358227])
Though, I don't know whether my patch can fix your problem.