Halfwidth and fullwidth forms error

Question

I am the original poster of the thread titled "How can I solve this space error?" below. 
 I haven't received any responses yet, so I've decided to open a new thread to provide more context. 
 As you can see from the image, this issue is related to full-width and half-width characters. 
 For some reason (possibly related to saving, based on my experience), what was being typed in half-width in korean suddenly changes to full-width. 
 Restarting Trados resolves the issue temporarily, but it recurs during further work. I have tried reinstalling the program, but that hasn't resolved the issue.

Paul · Answer

Kihwan Jung 
 Tricky one... so some guesses to try and be helpful.

Try changing the font to ensure you are using a fully unicode compliant font. Some fonts may automatically replace half-width characters with their full-width counterparts if the original font lacks support for the requested character.

If you're typing in Korean and accidentally switch to a mode that defaults to full-width characters, this might cause sudden changes. This might be triggered by pressing a hotkey unintentionally.

Some IMEs attempt to "normalise" text to match expected character widths, especially in mixed-script text. Perhaps this is at play here?

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Halfwidth and fullwidth forms error