Hi Tam, if you recreate the brushes in ver6, they open in ver7, BUT they have no dynamics at all. This basically creates tip shapes.

Adobe revamped the brush engine in ver7 so the brushes can't be backwards-compatible (even if you turn off the dynamic settings).

Best thing to do is find a system running ver6 and create brushes that don't need to take advantage of dynamics, and create brushes that need dynamic settings (leaves, grass, hair...) in ver7.

:)
retrocity

ps. cool brushes ;)