Version: 3.96.1 (using KDE 4.4.0) Compiler: gcc 4.4.1 OS: Linux Installed from: Fedora RPMs In KMyMoney2 the Forecast by Month chart used to have a legend so you could work out which line belonged to which account, in latest version there is no legend for this chart.
After a certain quantity of accounts, the legend is taken to prevent from flooding the screen. This is governed by the maximumLegendItems in your config file. No UI option for now, sorry. You can still know which line belongs to which account by hovering over the lines.