This is very odd and can't say for sure it is as a result of tabs module.. but disabling tabs fixes it.

my page looks like this: http://screencast.com/t/YmMwZGVkNzgt

the urls for the 2 custom $links i have shown in red are broken (they look like: http://mysite/mypage#ui-tabs-20) as well the views hover link shown in red .. the links shown in blue still work.

when i comment out the tabs_render line in my tpl for this page.. the links work again.

odd thing is this used to work and i haven't updated the tabs module since it did work.

i think this is using 1.0 - 1.3 doesn't work at all; nor does dev.. likely the api has changed.

perhaps something else was updated that does affect this.. like jquery core or similar