behaviour sceDisplayWaitVblankStart?

[Ghoti]

Hi folks,

my game is getting big with alot of code.
Now everytime i try to put some code extra i get a flickering blackscreen/gamescreen screen. Now i use sceDisplayWaitVblankStart(); just before the flipscreen() function. If i do that i get that strange flickering, if i however put the sceDisplayWaitVblankStart before my whole rendering code then i have not got the flickering screen.

now my question: sceDisplayWaitVblankStart waits till a vertical blank. is flipping right after to quick or is there some other reason why it can't that way?

[Drakonite]

Sounds almost like you might be drawing to the front buffer instead of drawing to a back buffer..