Every time I create a grid and save the workspace on your new ProTraderMC and log out and log back in, the grids disappear. Seems like they are not saved at all.
The earlier version of ProTrader (Not ProTraderMC) had a similar issue with grids too. Sometimes it just crashed on exit after you modified a grid element (i.e. increased grid size) and those changes were gone when you logged back in. But at least sometimes it let you save the grid layouts. It was hit and miss with grids.