The symbols for start/pause/stop are not visible. I do not know whether this is a flash player problem or something else. There is nothing wrong with running the flash player on streaming video on IE11 and there is no problem with the sound. Moving the mouse along to the right there comes a point when the vertical line for volume shows up. The flash player on other browsers like chrome, opera or firefox are all complete with their controls. IE11 however fails to be up their standard. How can this e corrected, please?
Without being able to look at it, it's hard to say why it's not displaying the controls on IE. Since Flash Player itself doesn't provide controls, it's most likely some subtle layout bug in the content itself.
To give you any useful advice, I'm going to need a link to the problem content.