I updated today
$this->bbcode_second_pass_code('', 'linux-raspberrypi-4.4.14-2-armv7h.pkg.tar.xz
raspberrypi-firmware-20160702-1-any.pkg.tar.xz
raspberrypi-firmware-bootloader-20160702-1-any.pkg.tar.xz
raspberrypi-firmware-bootloader-x-20160702-1-any.pkg.tar.xz
raspberrypi-firmware-tools-20160702-1-any.pkg.tar.xz
raspberrypi-firmware-examples-20160702-1-any.pkg.tar.xz')
had problems logging in to an openbox (via slim) and using various commands
$this->bbcode_second_pass_code('', '
robin@squeekat:/var/log
$ vim slim.log
vim: symbol lookup error: /opt/vc/lib/libEGL.so.1: undefined symbol: glDiscardFramebufferEXT
')
I downgraded kernel and raspberrypi firmwares to
$this->bbcode_second_pass_code('', 'linux-raspberrypi-4.4.13-2-armv7h.pkg.tar.xz
raspberrypi-firmware-20160613-1-any.pkg.tar.xz
raspberrypi-firmware-bootloader-20160613-1-any.pkg.tar.xz
raspberrypi-firmware-bootloader-x-20160613-1-any.pkg.tar.xz
raspberrypi-firmware-examples-20160613-1-any.pkg.tar.xz
raspberrypi-firmware-tools-20160613-1-any.pkg.tar.xz')
and stuff now works as expected.
Edit 13-07-2016: the 20160708-1 release of these packages seems to fix the issue.