I'm not aware of any add-ons which would cause this. It's been happening for a few years now, even after I switched to a new PC a year or so ago (although I copied Windows from the old PC to the new...

No, if I click and drag where the "invisible" text is, I just get a blue block (on Ebay), similar to the blue search box in my image.
Thanks

I have a rather odd problem when using certain websites (eg Ebay - see image below). Most websites display correctly, but on a few, parts of the text are invisible - the text is there, and can be...