[mbert]

Is there any way to get the middle mouse button working on the test builds? Unlike on the old 32-bit version, the middle mouse button seems to have the same function as the left one, i.e. no tab is opened.

[Fnordoz]

This is working correctly for me, but I have my middle mouse button configured to be command click instead of a middle click.

Maybe your mouse driver is sending different clicks to the 32 bit version and the beta. I'm using USB Overdrive and I have to have two identical profiles pointing to the stable version and the beta.

[mbert]

This is strange. I am getting this effect with both, external mice and my trackpad. With external mice, it does not matter whether it is my Apple mouse or the small Logitech I use when on the road. On the trackpad I use the MiddleClick utility. I have the problem only with OW, in Chrome or Safari everything works as expected.