I'm running an HP Pavilion 762n, 2.6GHz chip, 512Mb RAM, with Windows XP. I had a new 80 Gb hard drive installed about two months ago. The conflict arises between Photoshop 6.0 and Carrara 4.3 and never used to happen with C2. The conflict happens most, not all, of the time...but figure on the average of 80% of the time. It'll happen as soon as I launch Photoshop and go to open a document. Nothing will happen, but sometimes the UI [toolbar] greys out. When I click the Xbox [upper right corner] to close the app., I get the dialog box that says: "The program is not responding. Do you want to end now?" I say 'yes' and it closes promptly.

But it never happens if I have Photoshop running before launching Carrara.