I got stuck too. I spent too much trust on CPU instead of memory. That limited my total compute to 30K, I needed 50K for the upgrade and the quantum boost wore off before I could reach 50K. I ended up having to click the quantum button using javascript, because I couldn't click fast enough. That got me unstuck.

I apparently played that stage too well and completed it before I had made enough paper clips (which becomes the new currency then) to get anything started at all in the next stage.

[spoiler] It unlocks at 10, 50 and 100 factories or something like that, same with drones, 5k, 50k etc. [/spoiler]