It's not the grid (I don't think) but the rollback is broken in general as you have to reload the page manually after clicking rollback. The unrolled back content is still what's in the window so if you save and publish you get back this version. If you manually refresh then you get the rolled back version.
Grid layouts and rollback
We have discovered that if we use a grid layout then then HTML is not visible for users to rollback
I've just noticed this issue.
It's not the grid (I don't think) but the rollback is broken in general as you have to reload the page manually after clicking rollback. The unrolled back content is still what's in the window so if you save and publish you get back this version. If you manually refresh then you get the rolled back version.
http://issues.umbraco.org/issue/U4-5222
is working on a reply...