Yes it works – sometimes. My limited experience (approximately ten prints) indicates some serious problems:
Three times, when selecting “print” in CS 3, the program has told me I need to have a printer installed.
Twice, when selecting a profile for soft proof, the program informed me “insufficient RAM”; 1.5 GB was being used, with 1.75 unused. On one occasion, a fatal error occurred.
An attempt to use “user defined” size, in this case 17x25 in, resulted in a print not centered and an inability to use landscape mode.
I find myself still resorting to CS to print reliably.
Have you encountered any of these problems?
No, haven't encountered any of them.
When you installed the Patcher Application, did you follow their instructions about first deleting your printer and your Preferences and then re-instating them after the install? If you did not follow these instructions you may have a corrupted installation. In this case you should uninstall Photoshop, delete the printer, re-install Photoshop CS3, re-install the Patcher Application and re-instate the printer. Before you do any of this, save-out your custom settings, preferences, keyboard shortcuts and actions to your desktop, and note the exact folders where they should be re-introduced within the Program Folder.
Are you running a Mac or a PC? If PC you should not have centering problems with this Patcher. On a Mac I believe it should work too, but I haven't tested it on a Mac. I know it works for PC. What model printer is it? Did you define the custom size in the printer driver Paper tab? Do you have "Centered" checked in both the printer driver (if it provides for this) and the Photoshop Print Window?
Selecting a soft-proof should be no problem at all, as it has nothing to do with the Print Module. That function, as far as I know, was not affected by the 10.0.1 patch. This all makes me think you have a corrupted installation and all these problems should go away with a proper re-install.