To add further.. googling brought me to this Bugzilla@Mozilla
which seems to describe similar to what I am seeing.
Guess what... I just realised that it only happens in Firefox.
IE and chrome are perfectly fine.
Im using Firefox 26.0, so I specifically googled adding firefox and what do I find?
Oh well at least I feel better now, knowing that Im not the only one and there are many more posts like this
Thanks everyone for the replies, most appreciated... and also to HP for the mention of ownership permissions which set me on the right track.
Edited to add
It looks like the same problem is also replicated on Linux/Mac in Firefox 27.0 (beta) - linky
, so a heads up to you guys too.