I have some common hole sizes saved as favorites - dia 20, dia 16, etc.

Every few days they all change size to zero point something - why would this be???

Also a message pops up at some stage (not sure if related) "ANSI metric could not be located. Using the parent of this standard instead" or similar to this effect.

What will fix this for me? (Im still using SW2009 SP4, x32)

Cheers Mike