Had the same issue ones but was able to get around it by clicking twice in the address bar and then hit enter (that's how I reload pages).
Don't know why but it just worked for me.
If that did not work then you may also want to try logging off then remove all history and cookies then open new browser window and log on again.
If that still not worked then you best mail to info@cgtrader.com or wait a day to see if issue gets resolved.