Hi James,
You need to put the mouse over the dividers in the column headers, and drag the column widths with the left mouse button.
It's a bit of a pain, and we'll fix it soon. Basically the columns size to the original width of the dashboard panel - and if this is closed on start-up, then they are sized accordingly (to their minimums). This is why you don't see this problem if the dashboard is pinned open when RM starts.