All my custom icons have disappeared in LPX

I don't have a lot of time to go into this, because I'm on a deadline, but I've been having s few issues with my iMac recently, but been too busy to look into things. Today, Logic played up, while trying to add a Kontakt library.

After getting things up and running again, i found that all my custom icons have now disappeared. I had around 100. This is not only puzzling, but very annoying, as I rely on this type of thing for speed. I don't have to spend on it right now. I couldn't locate where they are kept. I open the package contents but couldn't see anything. Does anyone have any idea why this has happened, or where I can locate the custom icons folder, please?

I have a recent Time Machine back up , but for some bizarre reason I couldn't use the enter Time Machine function. It simply didn't work.Yep, another weird thing going on. Time to buy a new machine, I think.

Thanks if anyone can help.....