I'm using IDEA 7.0.3. If I set the font to Tahoma 12pt and open a txt file with a tab (ascii 9, not just spaces) in it then sometimes the tab won't display. It's not that the tab is really small, the tab actually will be invisible to the cursor. For instance, take the following line: :gamePlatform rdfs:domain There is a tab character between the end of :gamePlatform and the beginning of rdfs:domain. If I paste that into a txt file in idea, it will not display that tab. Not only that, but if I position the cursor before the tab and hit right, it will put the cursor after the "r". If I put more text at the beginning of the line then the tab displays properly and works properly with the cursor. If I choose "Show Whitespaces" in the view menu then nothing will be displayed to indicate the tab is there. I don't normally notice this because I have idea set to insert 4 spaces instead of tabs, but it does happen if I open a file that already has the tab in it. Out of curiosity I tried inserting tab characters using the alt-keypad method. I hit alt-keypad9 and it didn't insert a tab. For some reason alt-keypad65 inserts "A", but alt-keypad9 doesn't insert a tab.