The need to use z-index:1; in the css to overcome templates that have a position:relative involved has a side effect on the tool tips in all templates.
The effect is that the tool tip is partially masked as shown in pic z-index01.png - some templates are better, especially if they use a dark background for the tool tip.
Tested by removing z-index: 1; gave good result as shown in pic z-index02.png
A solution by adding the css code below to jdownloads-fe.css in in pic z-index03.png where the optional styling is included - jDownloads specific!
The styling can be adjusted of course.
If the optional styling is removed then result is z-index04.png
/* ++++++++++++++ .tooltip-inner for v3.x series ++++++++++++++ */
/* ++++++++++++++ .tip for v2.5 series ++++++++++++++ */
/* optional styling omit for tempate defaults*/
border: solid 2px #0000ff !important;
background: #CCFFFF !important; /* pale blue */
/* +++ items below are essential */
This code needs to be added to jdownloads_fe.css either with or without optional styling.
When the Gantry template series has been modified the special css code relating to position:relative; could be removed if desired, but probably better to keep in place.