change paintengin to openGL

[jh]

hi,

i have some problems using qpainter to overpaint a glwidget. it worked fine in the past but since 4.6.3 a qpainter
does not work anymore. it crashes even the overpainting example.
it still works on a macbook (vista, 4.6.3, nvidia) but not on an older laptop with an ati card (X300). since
it worked with 4.5.3 i would like to change the paint engine back to OpenGL (instead of OpenGL2)
how can i do that?

regards,
jh