every now and again SDK becomes unusable...

[stamatis]

For everyone's benefit, turn on Variable Preservation in the LiveCode preferences/Script Editor/Variable Preservation = true

CanelaDB stores important information about your setup in script local variables. They can lose the values when you stop and edit your code. LiveCode developed the Variable Preservation mode to protect the content of your script local variables.

Give this a try and see how it goes.

That's not the cause of my issues; variable preservation is on by default i believe - or i switched on long enough ago that i don't remember doing it
Certainly this has been on all the time i've been using LiveCloud...