I have an ASIair Pro, with firmware version 2.2. For the past year (meaning with older versions of the firmware) and now, it no longer stacks my light frames. It used to but not in the past year. Instead, after selecting the frames and tapping "Stack" I get the following error message: "FILE READ ERROR - Process stopped due to an error occurred while reading files." Is there a cure to fix this? By the way, I am able to create master darks and flats, but I can't combine my light images.