Ctrl+Alt+F1 to F6 work as they always have giving me tty1 to tty6.
Ctrl+Alt+F7 gives me a black screen with
Loading sensors modules:
Starting sensord:
Starting netprofile: The default is the current profile.
Checking for new hardware
The first three lines are followed by a normal
[ OK ], but it seems that the checking for new hardware is never finished.
Ctrl+Alt+F8 gives me back my first graphical screen, or in other words, it does what Ctrl+Alt+F7 used to do.
Edit: The machine is an Acer Aspire M5201 desktop, with the KDE version of PCLinuxOS, fully updated and with lots of additional programmes.