It is a known issue, with the grid cell, and it has been fixed in development.
We will be publishing a slew of minor hotfixes for our plugins, including Layouts, in preparation for the expected release of WP 4.7 on December 6, and it will be included with that release.
Sorry for the inconvenience you might experience in the meantime.
I'm just reviewing the tickets marked as fixed in next release in anticipation of a slew of updates for the main Toolset plugins intended to be published after the weekend when testing is completed.
It looks as if it should have already been fixed in the previous releases in December and this thread was overlooked, let me know if you still experience any problems.
This issue is looking OK now. However, there's another weird issue being introduced whereby you click on a row/cell in Layouts to edit the contents and the CSS classes are emptied.
This issue is looking OK now. However, there's another weird issue being introduced whereby you click on a row/cell in Layouts to edit the contents and the CSS classes are emptied.