Default z-index is under Bootstrap's modal.

[kyourek]

The default theme's z-index of '100' is less than the z-index of Bootstrap's modal dialog, causing the tooltip to be hidden when the default theme is used for plots shown in a modal.

The minimum z-index I used to make the tooltip visible was '1040' (which is the z-index of Bootstrap's .modal class).

This issue is easily rectifiable by altering the z-index on either the tooltip or the modal, but, with the popularity of Bootstrap, it might be a good idea to have tooltips in modals "just work".

[awmeade]

This issue seems to have returned with Bootstrap 3. Tooltips are hidden with the 1040 index value. When I made them arbitrarily large (e.g., 1240), they reappeared.

[briedis]

+1 .tooltip { z-index:1240; } helps!

[tomascharad]

+1!!

[brandonrohde]

+1!

[Carenthir]

In my version of the plugin, the actual class is called "flotTip".
So for me, this helped : .flotTip { z-index: 9999 !important; }

[nam-bash]

+1 .tooltip { z-index:1240; } also work's for me