Is there a reason why you cannot see the values of 1- and 2-letter variables in VS graphics debugger?

[Waaayoff 952]

Just curious. My shader had some of these variables and I wasn't able to read their values and when adding them to a watch list they had an invalid expression for a value. Giving them a longer name worked. But why?

[Jason Z 6437]

Which version of Visual Studio were you using, and on which operating system?  Also, was there a particular type of variable that had the issue (i.e. local, a certain type, input/output registers, etc...)?  If you post a shader, we could try it out to see if it occurs the same on our end.