Recent apps window doesn't show up when using Google Now Launcher but works well for stock launcher I have a Oppo Find 7 phone running Lollipop.

Since I don't really like ColorOS launcher, I decided to download Google Now Launcher from Play Store and set it as default launcher.

It works perfectly, except for the fact that neither of the hardware keys (not even while long-pressing) shows the recent apps window (i.e. where to close recently opened apps).

Is it normal? Is there any workaround?
It seems there's a bug in ColorOS. Updating to latest beta (2.1.4i) solved it.  Betas can be downloaded from the OPPO forums and flashed like any other ROM package.