Are you sure you don't have say a v025 save in a v026 game? Because what you describe suggest this. I played v025 form the beginning for rewriting the walkthrough which you seem to quote. I didn't encounter this problem in Linux. It could be a Mac specific problem though. Please give a md5 checksum of bookmark01.dat so I can see which version of saves you're using. But if I understand correctly you already solved this one. However if it is an old save you will likely run into other problems...