I have CS5 Photoshop and suddenly am getting a giant arrow attached to giant line instead of a the .5 pt line I expected to get as I've always used. I've tried everything and can't seem to get rid of it. Please help!
Look in the Option Bar. On the right, you should see something like
This is CS6, but CS5 should be similar. Set the width of the line in the 'Weight' field. Clik on the cogwheel icon (red arrow) to bring up the Arrowhead menu:
Check the line tools settings in the option bar and if the look good try resetting the Photoshop tool or Photoshop all tools.
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