Clear the cache and the cookies from sites that cause problems.

"Clear the Cache":

• Tools > Options > Advanced > Network > Cached Web Content: "Clear Now"

"Remove Cookies" from sites causing problems:

• Tools > Options > Privacy > Cookies: "Show Cookies"

Start Firefox in Safe Mode to check if one of the extensions (Firefox/Tools > Add-ons > Extensions) or if hardware acceleration is causing the problem (switch to the DEFAULT theme: Firefox/Tools > Add-ons > Appearance).

• Do NOT click the Reset button on the Safe mode start window or otherwise make changes.

• https://support.mozilla.org/kb/Safe+Mode
• https://support.mozilla.org/kb/Troubleshooting+extensions+and+themes

Thank you, worked a treat!

I have been through this process several times. It sometimes works and sometimes it doesn't. Running in safe mode proves nothing.

Youtube videos work fine. So flash is working. Hosts file is the default one so nothing blocked). No sit blockers etc. all disabled in add-on manager.

Old Soundcloud works fine. Sometimes the new one does. Most of the time it does not.

Switch to IE8 (yuch) and this gets even worse. Old SC works but new one says I need an update and provides a link. I click the link and MS site says I am a;ready running the most up to date browser.

Bottom line... 1) if you use IE, better go to Windows 7 or 8. Otherwise Soundcloud should be avoided. Sure, the old SC still works ... for now.

2) if you use Firefox, roll dem bones and see what ya get. Maybe it will work. Maybe it won't. But it's a pain to have to keep clearing the cache and cookies to fix the one and only site that has this issue with Firefox 18.

3) go to Chrome if you love google. It seems to be OK.

4) ignore soundcloud all together. It's not going to survive long in this mode.