Hi Martin, I worked on the problem on my WordPress Theme (Pro Photo 6), and I found a solution. Could you add a way for your customers to solve same issues on the next patch ?

Ligne 611
.flowplayer .fp-timestamp {
background-color: rgba(0, 0, 0, .65);
color: #ffffff;
display: none;
border-radius: .2em;
padding: .1em .3em;
font-size: 90%;
bottom: 1.4em;
height: auto; }

Ligne 844
.flowplayer .fp-qsel-menu {
width: auto;
color: #ffffff; }

I had to define color text on these 2 class, and it solved my problem.

Thank you for your answer, Martin !