Myself and another developer have experience a weird issue where the full sql statement is not being executed. The other developer found that if he just hits the "end" key after typing a statement the SQL Window is adding an additional hidden character. And anything after this character is getting ignored, as well as ignored if you do a select all and copy and past to another window. Unfortunately I can't reproduce on my computer. So the "end" on my keyboard is different I guess. Can you try to reproduce this? This is extremely concerning cause if someones happens to do this with and update statement we will be in big trouble. Or we could be sending someone wrong results.
Try typing:
select * from scott.emp where mgr = 7698
Then hit the "end key"
Try typing:
select * from scott.emp where mgr = 7698
Then hit the "end key"