Hi. Here is problem with last nightly.
When i edit properties(doble-click or move cursor on component and hit E) it adding blank line, and when I hit Ok it gives error, about no empty line allowed. Fine. I delete line and Ok, and it save. But next component - same, or even component i edited before. It always adding this blank properties line, and it annoying.
May be it because new properties window. don’t know.
When you report a bug, even if you only ask here first before submitting to the bug database, always give the exact version from Help->About->Copy Version info. Also you didn’t tell what properties window you mean and from which subprogram (eeshcema, pcbnew…). “Component” is ambiguous, use “symbol” or “footprint” instead.
I can see if it happens to me, too, if you tell these details.
There is no tool called component properties window in the english version (KiCad version 5 always uses either the word footprint or symbol. Never the word component.)
If you are not sure how the tool is called in english then first switch KiCad to english. (main window -> preferences -> language.)
And even if we know if you mean footprint or symbol we still do not know how you reached that tool. (One can open similarly named tools for a symbol placed in a schematic as one can for a symbol in the symbol editor. The same is true for footprints.)