I hope this is the right section to post this.

SED is a bit buggy.
I lost a lot of hard work, and still don't know what happened.
I constantly saved my work under one file name. When I attempted to save again, the file was not there, or perhaps it was, but the file name now ended with 001. Furthermore, the file was now smaller in size, and the codes I had put in were no longer there. It's a good thing I had backed up a previous saved file.
Also, I got a crash for no apparent reason. After removing a good few lines I had recently put in, it worked. I then realized that it seems the function had too many lines. I realized this was definitely the case when I had to shorten it a bit more on another occasion when I run SED.
That means I am a bit limited in what I want to accomplish.
Maybe a future update will correct these problems.

I have got a random crash on occasion in SED, but it's been rare. These other errors I have never experienced.

I've been working in SED for a good few years now, and for me it has been pretty reliable. So I don't know what's going on with your computer.

I'm not saying that SED is a bad program. As I said before, I like SED, primarily for its simplicity. Every game engine has its limitations, or disadvantages, which are made up for by expert programmers. I was just expressing what I experienced just in case there were due to bugs in the program. However, as you suggested, I will check if the problem is with my computer. Perhaps it needs 1 GB or ram, instead of 512.