This might not be a bug but I thought it might be helpful to share.
I like to highlight my Greek text so that at a glance I can see what tense each verb is (Perfect = Red, Present = Yellow etc.). So, I consulted the help file and discovered I needed to start a new visual filter document. In it I opened up the Morphology window with "@ and clicked Verb and Present which resulted in @V??P". Then I selected the yellow highlighting tool However, it doesn't work, in fact when I went back to the document Participle was highlighted in the morphology selection box, Logos thought P stood for Participle instead of present. Finally I figured out that typing "@V??P??" would force Logos to do what I wanted. When I went back to Logos 3 I found that the ending ?s were added automatically when adding items to a visual filter.
Overall I like the new visual filter scheme: it's more streamlined and intuitive (with the exception of this issue). Logos 4 would benefit from the ability to add automatically the ? for the variables that aren't specified, especially as people come on board with no LDLS 3 experience.