Annoying, though not fatal. Mostly FYI. Seen in both WorkVisual 4.0.17 and 4.0.25
I'm collecting a lot of O-scope traces through WV lately. I've noticed that WV has a tendency to "lose" the controller selection when I'm switching between the Trace Config and Trace Display tabs. This shows up in a "Save Failed" error when I make an adjustment to the Trace config and try to save it to the controller. So far, this is fixable by going into the Cell Tree window on the right, de-selecting and then re-selecting the controller I'm testing on.
Another bug appears to be a n issue with the implementation of the Windows file handler. When saving a screenshot of a Trace (Right-click in the Trace display, select "Save Screenshot"), having any periods in the filename causes WV to crash and restart. Underscores work fine, however.