Your comments

No worries about the "lost" model. It was trivial, and imported from DDL. Thank you very much for looking into this!

Oh, that's what it was! It's probably a bug in a way. I've created my model with my user Then I shared it to I opened the share in the same browser session, and then unshared it, when it disappeared.

Sorry for the confusion in this "idea". I still hope the feedback is helpful.

Hmm, for some reason I hadn't seen this link. And for some reason it was inactive (perhaps because I shared via E-Mail?) and when I unshared, the diagram was lost, is this possible?

Oh, "snap to grid" is useful as well. I think they're both complementary...

Hmm, "Shift" is used to toggle between single-item selection and block selection in most tools. In other words, "Shift" would be the "select area" tool.

I'm not sure if it is a good idea to go against the commonly used short cuts. I'd definitely favour "Ctrl" over "Shift".

Anyway, for the time being, thanks for the heads-up :-)