Hello,
I had the same problem and I think, there is a simple solution.
With the firmware 1.1.3/1.1.4 some of the paths were changed. IMGrab searches for a file called "History.plist". This file could be found under
"var/mobile/Library/Safari/History.plist". IMGrab references to a different path, meaning the program is looking in the wrong place (var/root/Library/Safari/History.plist), causing the 1003 error.
The solution is to set the path to "var/mobile/Library/Safari/History.plist".
This is also necessary, if you want to save the picture, because IMGrab refers here also to the wrong path, causing the 1040 error. The path should be
"var/mobile/Media/DCIM/100Apple".
How to change the paths? I've done it with Jiggy (great program by the way). I'm certainly no expert in Java, but the fact that I could fix IMGrab says a lot about Jiggy. Any other program to edit the file "main.js" does it to.
If you have any further questions, do not hesitate to ask.