I'm running CT on Win10 (Parallels).
Almost whenever I edit the source segment (Japanese), CT aborts.
>I'm running CT on Win10 (Parallels).
>Almost whenever I edit the source segment (Japanese), CT aborts.
Perhaps you should try CafeTran on OS X?
There are lots of variables in your system configuration: Java, Parallels, Windows, Mac and iMac with 4k second monitor. Try to eliminate one variable at a time to find out the cause of the crash. For example, disconnect the second monitor and check.
For this system configuration, I would definitely suggest increasing RAM memory for CafeTran's Java as much as you can. Also, play with the font size for the current segment to see if the font too large can be an issue for the Japanese characters to type.