I had a similar problem which was solved by looking at the scripts. One of them had the tab key assigned to its function.
Look in the scripts to see if any scripts are using the Tab key as a short-cut key, or look in the keyboard customisations, in the settings for anything there. -- Vas <http://forum.pspad.com/read.php?2,40881,40884> PSPad freeware editor http://www.pspad.com
