Heya,
Running KSP 1.11.2.3077 and Trajectories 2.4.0 (& KAC and no other mods), I superficially get what I'd expect to see on the map screen (a red line and a cross), but I don't get any options in the stock toolbar.
I have the following in my log which seems relevant:
[LOG 10:09:07.591] [Trajectories] v2.4.0 Starting
[LOG 10:09:07.595] [Trajectories] Loading settings
[ERR 10:09:07.627] Exception loading ScenarioModule Trajectories: System.Reflection.ReflectionTypeLoadException: Exception of type 'System.Reflection.ReflectionTypeLoadException' was thrown.
at (wrapper managed-to-native) System.Reflection.Assembly.GetTypes(System.Reflection.Assembly,bool)
at System.Reflection.Assembly.GetTypes () [0x00000] in <ad04dee02e7e4a85a1299c7ee81c79f6>:0
at AssemblyLoader+LoadedAssembly.TypeOperation (System.Action`1[T] action) [0x00006] in <06f13185617646e5bc801baeab53ab75>:0
at AssemblyLoader+LoadedAssembyList.TypeOperation (System.Action`1[T] action) [0x0001c] in <06f13185617646e5bc801baeab53ab75>:0
at Trajectories.ToolbarTypes.getType (System.String name) [0x00014] in <1599f0119b6e426290c88a610947d26e>:0
at Trajectories.ToolbarManager.get_Instance () [0x00023] in <1599f0119b6e426290c88a610947d26e>:0
at Trajectories.ToolbarManager.get_ToolbarAvailable () [0x0000c] in <1599f0119b6e426290c88a610947d26e>:0
at Trajectories.MainGUI+<>c.<Allocate>b__88_38 () [0x00000] in <1599f0119b6e426290c88a610947d26e>:0
at DialogGUIToggle..ctor (System.Func`1[TResult] set, System.String lbel, Callback`1[T] selected, System.Single w, System.Single h) [0x00045] in <06f13185617646e5bc801baeab53ab75>:0
at Trajectories.MainGUI.Allocate () [0x00f96] in <1599f0119b6e426290c88a610947d26e>:0
at Trajectories.MainGUI.Start () [0x00007] in <1599f0119b6e426290c88a610947d26e>:0
at Trajectories.Trajectories.OnLoad (ConfigNode node) [0x0003c] in <1599f0119b6e426290c88a610947d26e>:0
at ScenarioModule.Load (ConfigNode node) [0x0000e] in <06f13185617646e5bc801baeab53ab75>:0
at ScenarioRunner.AddModule (ConfigNode node) [0x0005e] in <06f13185617646e5bc801baeab53ab75>:0
The solution for me here is probably "install Blizzy's toolbar" but in case it's any use to you...