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I tried to rendezvous in 0.17, but I failed because, once I got close, I burned straight towards the target instead of killing relative velocity. When 0.18 came with all of the rendezvous and docking aids, I could rendezvous and dock no problem.

Change the camera angle so that you can place it radially underneath the booster.

Landed Jeb, Bill, and Bob on Laythe and brought them back to Kerbin.

If it sounds like , then you may be experiencing something similar to this.

My downright favorite old game is Pikmin 2. It just has so much replay value for me, especially doing different challenge runs through the game. I just decided to replay it again and I'm trying to do the 7-day run.

Because of the different gravity on Duna, something that has been tested to work on Kerbin may not line up correctly on Duna. Try using physical timewarp to help "adjust" the height of the craft until you get it to dock (may destroy the crafts).

Nuclear pulse propulsion.

I'm pretty sure going directly into a 500 km orbit is more efficient.

Make sure the velocity shown above the navball is set to "Surface". If it is set to "Orbit", click on it until it says "Surface". This will show the velocity relative to the surface instead of your orbital velocity. Because the Mun is rotating underneath you, you have to account for that.

A beautifully failed Laythe landing.

Today, on July 5, Earth is at aphelion, which is about 152,000,000 km!

I've made a one-way manned landing on Duna without the LV-N engine. I also got to Laythe, and escaped the solar system using a failed Mun lander.

They've had to do this for the 0.17-0.18 transition, but it hasn't happened since, and with the known changes coming up in 0.21, it doesn't seem likely this update. Here is MechJeb.

Aerospikes for some reason tend to cause your rocket to spin out, so try using the LV-T30 or LV-T45 engines instead. Also, check the position of the center of mass of the rover and make sure it is alinged with the docking port you attached. The craft's CoM may look centered on takeoff, but as you burn fuel, the CoM may shift. If that doesn't solve the problem, do the gravity turn earlier at around 5 km and gradually turn over, staying pointed near your prograde vector.

You want to go into the settings.cfg in the KSP folder and look for the line that says, "CONIC_PATCH_DRAW_MODE". By default, it will be set to 3, but change it to 0. Then, in game, when you get an encounter, the encounter trajectory will be shown around the current position of the planet you are encountering instead of its position in the future. This allows you to switch your camera view to the target planet and see if the trajectory shown is going prograde or retrograde. If the encounter trajectory is going counterclockwise, it is a prograde orbit. If it is clockwise, it is retrograde.

Try zooming in and adjusting the camera angle so that the current and post-encounter trajectories are separated enough so that you can place a maneuver node on the current orbit.

Try building a lander with radially attached engines that can have the rover decouple underneath it and use the I-beams to extend the landing legs below it. Then, launch the entire thing upside-down so the lifter doesn't break the rover. Something like this:

Check the position of the center of lift and the center of mass on your SSTO. You never want the CoL to be in front of the CoM, but if the CoL is too far behind the CoM, it will tend to pitch down a lot making it difficult to control. When you go to another planet, try to use the LV-N engine because it is most efficient. If you are having trouble, you may want MechJeb, but the Kerbal Engineer Redux is also good if you are just looking for data. To figure out the launch windoews, use this calculator to get the phase angles.

When 0.20 came out, I didn't realize that the Skipper and Sr. docking port existed until I saw it here on the forums.

When you want to press alt+. when something is moving slowly.

When the fairings jettison from the engines, they crash into the others which cause some to rip loose. Try rotating them with Shift+Q and E so when the fairings decouple, they don't crash into the other engines.

So, what's your question? On-topic:

This is a known bug where "Undock" will not do anything. Here is a fix for it.

I've had problems like this with stock launchers, too. The best way to prevent it from flipping over during your gravity turn is to do it early and gradually instead of suddenly at 10 km. Start it at 5 km and slowly turn over throughout your ascent.

I have a save from 0.18, although I have multiple saves so the game doesn't lag as much with several flights in progress.