Badd issue with Windows Blind 8

I am encountering a very bad issue with theme manager.

I try a theme (Lantana) .. The result is absolutely incompatible with Mozilla Thunderbird! ! !

this is a part of the window of Thunderbird

Also when I move the mouse over this windows, it is blinking and I can see my messages ...

But it is blinking randomly and with a high rate : I'll have headache to read

I go back to default theme .. and here is the issue : when I try to see the properties of a disk i receive this :

Some texts are black on black .. this is a bit difficult to read for me.

What is wrong ?

Two bad issue with this product ... a bit disappointed because I bought all the other tools .

The one who works quite well is Fences ..

Pleas help me !

P.