Well well.... just found out that
@Mouth's and my problems are the
same problem...

For everyone who has the same problem that either the PowerTip is not on top on the z-index or not showing up at all... It is just a
typo issue... for use with UIX YOU NEED to adjust the CSS template... (for the default theme it seems to be no issue)
/* PowerTip Plugin */
#powerTip {
cursor: default;
box-shadow: 0px 12px 25px rgba(0,0,0, 0.5);
background-color: #FFFFFF;
border: 1px solid rgb(240, 240, 240);
border-radius: 6px;
color: rgb(44, 44, 44);
display: none;
padding: 10px;
position: absolute;
white-space: normal;
max-width: 400px;s
z-index: 2147483647;
}
The "s" after the ";" prevents the z-index from being processed at all... just delete it and it works...