Flashing green Dots

[Beaumis]

Hello,

I use BSplayer in the internal renderer overlay mode 2. However for a few files, it displays a line of flashing green dots at the bottom of the screen. This only happens in fullscreen mode and I have yet to find a commonality between the files. I suspect codec involvement, but havent gotten anywhere on that front either. I have tried switching modes, but it doesn't seem to make any difference.

I've attacked a screenshot for visual reference. I use BSplayer 2.56.

I can switch to other display modes, but all the overlay modes do not seem to support subtitles, which are rather important to me. If anyone has an idea what could cause this, or even better, a fix. I would grestly appreshiate it.