I downloaded some new brushes and now when I go to use them it says: Cannot complete action due to program error. Sometimes it works but mostly I get that message. Does this ever happen to you? How do I fix it?

maybe the brushes are for another program. I remember when I accidentally downloaded photoshop brushes for psp, I got that same error.

yaaa try downloading brushes from another place because some places have brushes that dont work .. that happened to me before .. i just got brushes from another site

I tried getting new brushes but now none of mine work when they worked yesterday.

Yup, that hapened to me, some sites may have that kind of problem when you download it... i don't know if they even excist...