I've been experiencing a couple of bugs. I'll go into detail.
Firstly, on this latest rack of mine, any new module I add gets placed directly over another module in the top row. While this isn't a big deal, I was sure the intended functionality was to have the module placed in the first available (large enough) slot. See the screenshot here: https://imgur.com/a/Zu6AHPT
Secondly, occasionally I click on a modules's info button instead of the add (+) button. I use a track pad on my laptop and I'm kinda clumsy. Often times when I press back to go back to my rack the rack itself is not how I left it. It's often in some other, earlier configuration from the same rack. I would suggest some sort of save feature. Even if I could manually save the configuration to ensure it stays as it is. I think this would reduce frustrations.
Thirdly, no big deal, I notice that the size (HP) of modules aren't listed on their individual info page.
I love modular grid! I couldn't do without it. I love how it helps me arrange things before I commit to moving it all around.
Thanks a bunch!