The ability to perform calculations within the smart dimension dialog recently stopped for me.  For example, when inputting a dimension I used to be able to say 4*2, and it would give me 8.  Now I get strange errors whenever I do this saying "you must use a number between 0 and 100,000 or something to that effect.  My SW rep says it could be a problem with my antivirus software blocking the functionality.  I've been using the same AV software (Avast) for several years and this problem just started happening a few weeks ago.  Has anyone else experience this?  Any solution?