Buttons disappear on mouse down

CCleaner for Windows CCleaner Windows Bug Reporting
1

When clicking on the "blue buttons" ("Analyze", "Scan for Issues", etc.) they become invisible during the mouse button is pressed. Thankfully the buttons still work...

I'm encountering this issue since CCleaner 5.29. It did not happen on CCleaner 5.28.

OS: Windows 7 64-bit

2

It seems to be fixed in CCleaner 5.30.

Thanks for your replies. (pun intended)