Wierd Window bug, Problems with radiant or compiling?

[Ultimate]

It's wierd, never happened to me before. and yes, im new here
Black window from inside( should see skybox).


Could the fast file warning be reason for it?( i think that warning is usual, not dangerous.)

screen fastfile csv error.png

Almost finished my map, but i wanna get those windows fixed. old parts where is same windows, doesn't have that problem. just those windows what i have made in this week.

screen1.png

screen2.png

[Drofder2004]

Its hard to tell exactly whats going on.

Are there any compiling issues?
The CSV issue is unlikely, but you should fix it anyway.

[Ultimate]

nop, there is no errors in compiling. only csv missing. BUT somewhy it fixed itself, i just changed couple things, like made windows separated from walls like 1 unit, so its good now:)