Just18 - I can't find an option to reapply the graphics card driver withing PCLOS control centre. Am I looking in the correct place?
I don't know where you are looking

PCC - Hardware - Config Graphics card - click on it ........ then make your selection of the correct graphics driver for you card and go through the process ...... if there is a new driver for your card it will notify you about a 'proprietary' driver being available ..... accept and finish with a reboot to have it applied ....