I was working on my map after re-installing hammer and after I had place some brushes using the x512 grid, it just suddenly switched the grid size to one hammer unit and I can't get it out. I haven't found any solutions to the bug yet (yes, I did Google it). Any suggestions?

tip 1: Restart hammer
tip 2: try the [ and ] buttons.
tip 3: report back if you tried tip 1&2

Shift + W

@iWork; Thanks! I'll have to remember that... and to make sure grid-snap is turned on.

I had this problem once, drove me insane
and now it happened again, and all I had to do was search
"hammer grid", here and bam!... problem solved
thanks iWork925