I can't reproduce. Can you give me some more info about your setup?

Windows 8.1, Intel Pentium N3540 processor. Happens straight from extraction with the latest nightly as of this writing, 6008-ccdbcf6, but also occurs in prior versions going back to at least 0.7.3 (probably before; I can check if you want) Actually, not quite, but there's some other interesting behavior before then; I'll write a full report in my next comment.

If there's anything else that would be useful, please let me know.

Here's a timeline of how this bug appears to have progressed:

• The bug did not appear in 0.6.3
• A similar bug appears in 0.7 beta 1, but instead the screen becomes vertically flipped, and solely when unmuting.
• In 0.7.0, muting toggles between the screen being vertically flipped and not, though occasionally if one is spam-pressing mute while paused, it skips a cycle.
• The current incarnation begins in 0.7.1

So then I tried to trace down when this stuff was introduced in the hourlies. Unfortunately, the hourlies appear to derive from master, whereas the releases derive from 0.7, so they aren't quite comparable; I wasn't able to find the vertical screen flipping version in the hourlies. But I was able to find the black screen version appears to have been introduced in 5202-7cc09c7

What GPU?

Also that's weird, muting it shouldn't affect how things are drawn. Are you using the menu to mute it or a hotkey?

My GPU is Intel HD Graphics and I'm using the menu to mute it.

Also, just to be clear, the screen does not continue to be black once unpaused again, sorry I didn't mention that early, but that's why I said it wasn't high-priority.

Should be fixed now, let me know

Worked like a charm!