Ok, PROBLEM FIXED.
And, for the record, here's the solution.
It would indeed appear that permissions are the problem.
But, giving the IUSR account read & execute permissions on ImageMagick directory, didn't make any diff.
You were on the right track though... found a Gallery system posting elsewhere that said in order for the exec function to work, you need to give read and exec to the cmd.exe located in the system32 directory.
Did that, and it works.
Removed read & exec from ImageMagick dir, and it still works.
So, looks like cmd.exe is the culprit.
Maybe when you guys write the docs for Captcha you can include this?
Thanks!
