OK. When I get some free time I'll try upgrading to the latest version (something I should have done a long time ago anyway) and see if the problem is solved.

And yes, I always have FX enabled (brightness & contrast, glow, and sometimes sepia). I'll try disabling them.

AND my project properties are never set the same as my final render, as I've just been leaving them at the default settings. I'll try fixing this so they match the final render.

Thanks for all the help so far Grazie, I really appreciate it!!

As soon as I've solved the problem (IF I solve it lol), I'll let you know.

Cheers,
Simon Adebisi.