I guess this is relatively trivial but I'll raise it anyway.. I noticed 'variable viewer' menu label is in Debugger & Tools menus. This was a bit confusing when I read about it in the help. It seems to me these 2 features are slightly different, with the latter more like a 'variable browser' (like the corresponding 'Procedure Browser'. Maybe the tools one should be relabelled to 'Variable Browser' to distinguish it. Sorry if this has been raised before - I did a quick search & couldn't find it mentioned before.
Also in the preferences for Variable viewer in ToolsPanel, it has 'Display Elements from all open sources'. Unchecking it seems to not show any variables in the current opened, though unsaved, source (however 'scan for variables' is checked'). Seems like 'Display Elements from all open sources' has to be checked to see anything, then of course it shows every other variable from other sources. I think either unchecking 'all open sources' should display at least the current open source's variables, or if checking 'all open sources' is needed to enable the feature, it would be good if the source name is shown beside each variable (e.g. source name in brackets). This would make it clear which variable belongs to which source in that window.
Another thing - the help for Variable Viewer (& the other debug tools) could be more explicit by indicating where these features can be found (in the Debugging menu).