Problem method setCacheMode in QGraphicsProxyWidget QT5

[artif27]

Hello all,

I deleted a call to the function setCacheMode(QGraphicsItem::ItemCoordinateCache) on a QGraphicsProxyWidget because i want to invoke manually the method update() which calls the paint event of my QGraphicsItem (if a cache is defined, paint is never called sometimes ).

But, i've got some problems now in order to show QGraphicsScene : the QGraphicsItems in the scene are never showed now. If I call the function setCacheMode(QGraphicsItem::ItemCoordinateCache) it's OK.

Any hint?
Thanks