can't select or move drawings with select tool

Hi, I’m suddenly unable to move my drawings with the select tool.

The only way I can select them is with a marquee box; if I click them directly they don’t select and if I click and drag them, they don’t move.

I can move drawings with the arrow keys (slowly), but I need to be able to click and drag them.

I’ve no clue why this suddenly started happening. I reloaded my scene and the problem persists.

Thanks for any help.