ken_b - 4:15 pm on May 9, 2013 (gmt 0)
First, it's better to ask questions like this BEFORE you make the change.
Try doing a site search [webmasterworld.com] here for change desciption and see what comes up.
If changing the Meta Description has a negative effect on your rankings, it isn't Google doing the "screwing over" they didn't make the change, you did.
whether Google is known to just screw over sites for little changes like this.