F.A.R Deep Space Launcher with Cylero Rover

@Forwind Thanks, I didn't know about the "K" button! So, if I left-click once on one of my engines or fuel adapters on the bottom of one of my stages, and the press "K" once, it will re-attach the engine or adapter properly? Again, thanks so much for your help, this isn't a support thread but I've asked around many threads and haven't been able to solve the problem, take care. Also, I tested your FAR launcher, it's amazing, keep up the great work! :)

@yopo your issue might be your rocket is too heavy or putting too much pressure on a individual engine. Pressing K while moving a selected part also helps you make sure it is attached properly. Hope this helps !

I build similar very large spacecraft like this awesome multi-stage rocket. I'm going to download and play with this craft, but I have a question for the creator @Forwind . Do you ever have trouble with your large multi-stage rockets partially exploding or having rocket engines fall off from the first or second stage as soon as the rocket is loaded on the launchpad in flight mode (after hitting "play button" in designer mode)? Every large rocket I've ever made that has more than one rocket engine in each stage, and has more than 2 stages, has had one or more of the first or second stage's rocket engines spontaneously fall off from the stage and either disable that stage and any stage below it, or it blows up the entire rocket. I've had to keep on rebuilding these rockets part-by-part from scratch until, seemingly at random, one of my rockets of that same design happens to have all of its part stay in their proper position and have all stages function properly. Since you're making these very large rockets, have you ever run into this weird problem? Thanks!