A new patch is available for those with macs and also a seperate Quicktime download for those with PCs.After the flaw that was found that could lead to some losing their Lindens I am pleased to see this level of co-operation and speed.
It would be a good idea to download this as soon as you can, then you can once again enjoy inworld movies and pictures.
The new release candidate from LL also has a new feature that will disable Quicktime if an older version is installed. Read more details on the official blog HERE