This event was reported to me numerous times from various draftpersons in the company, letting me suspect that this is not an isolated case:

Our drawings length units are set by default in fractions at 1/16" precision. We have encountered situations where the drawing was set to 1/2" precision without the draftperson noticing when or how, creating misleading dimensions in the drawings. This could eventualy lead to great manufacturing issues.

Did anyone else encountered this and is there something that could trigger this in any way? In my opinion unit setting is quite hard to change "accidently".

Using SW2013 SP2.0