Whenever I put an effect on one of my clips an orange 'X' goes through the display and the render. Does anyone know how to fix this?
I am pretty sure this does not happen with every effect, just with those from Boris FX (Sapphire).
It's very likely you use a trial version and need to buy a license. Check here: https://borisfx.com/faq/sapphire-trial-watermark/
If you already have bought a license then something might went wrong during activation and you should contact them for further support.