To reproduce

• Open a translation job
• translate a segment
• Press CTRL-ENTER to saven and open the next segment
• Press ALT+C to enter a comment and CTRL-D to put the segment on the bookmark list
• Write a comment
• Click again into the segment to place the cursor there and translate the segment
• Press CTRL-ENTER to saven and open the next segment
• Now the next segment (that should be translated) is opened, but the cursor is placed into the comment field.