Cursor getting stuck after splitting windows horizontally

Question

Recently I have started to split my Emacs windows horizontally. However, when I do this, moving the cursor down frequently raises the following error:

posn-col-row: Wrong type argument: windowp, #<frame buffer/file-name 0x11756e8>

And the cursor will be stuck wherever it is. In the example below, as soon as I hit the dollar sign/newline (I have whitespace-mode enabled to help myself with diagnosis) I can no longer move the cursor down (although I can always move left and right).

The stranger thing, is that if I have a horizontal split with two windows and the same buffer in each window, then the problem only happens in the window on the right...It seems to only happen when I have visual-line-mode disabled - but I have disabled it in certain modes precisely because visual-line-mode seems to do weird things when the window is too narrow, so I would prefer a fix that doesn't involve enabling visual-line-mode. Any suggestions? Thank you!

Update:

This problem was occurring on my work computer, and I just tried to recreate it on my home computer. My configuration is synced through github, so I thought everything was exactly the same, but I just remembered that the version of Emacs I am using at work (the one with the problem) is the one from the Ubuntu repositories, while the one I am using at home (which doesn't seem to have a problem) was compiled from source and is a newer version.

Knowing this, I will do some more debugging on Monday when I get back to my work computer, and maybe just get a more recent version of Emacs.

Answer 1

I was having this issue on my work computer, and once I got home, I tested it out on my home computer, which uses the same init file. No problems at all! This made things even more confusing for me, until I remembered that I was running an older version (24.4) on my work computer than on my home computer (running 24.5).

Today I installed Emacs 24.5 on my work computer following the super-easy instructions in the answer to this question. After that, I no longer have this issue, and everything works fine with horizontal and vertical window splits! I am not going to bother submitting a bug report, because it seems to have been fixed in the most recent version of Emacs.