Created attachment 132463 [details] GtkLauncher (GTK2) with Google Play Google Play Music page is only partially rendered (see attached screenshot of GtkLauncher) if Flash plugin is installed (version 11.1.102). It affects only GTK+ 2 port (GTK+ 3 port works fine). I've tried version 1.7.91 from Ubuntu 12.04 Beta 1 and nightly r111120 tarball (with ./configure --prefix=/usr --with-gtk=2.0 --enable-introspection), the bug is reproducible with both versions on my 64bit machine. This issue was not present in version 1.6.3.
Created attachment 133661 [details] GtkLauncher (GTK2) with Grooveshark
The bug is not specific to Google Play, it also affects Grooveshark (http://grooveshark.com) (and maybe other websites using flash). Reproducibility also depends on size of the window (less reproducible with a default window size, more reproducible if window is maximized before entering affected website). I'm increasing priority according to Bug Reporting Guidelines ("If you know the bug is a regression, ie. something is wrong which wasn't wrong in previous versions of WebKit, you can set this to P1.").
This is also a bug for songza & confirmed for grooveshark and pandora.
Also affects Rdio http://www.rdio.com/
Going to close this since the version of WebKitGTK+ is old enough that I don't think we can fix this. Please reopen if you notice this issue with a more recent version.