For those of you having errors related to permissions, I have some news to share.
I also randomly started having these kinds of errors (Access Denied, etc) when Cartographer tries to create files of any kind, even on previously tested & working versions. I was able to track down the issue in my case - it is an AntiVirus feature that protects folders from being modified by ransomware, which was probably added or enabled by a recent update. Even if you don't use an antivirus program such as AVG, Symantec, Kaspersky, etc. the default Windows Defender in Windows 10 also has this feature, and it's possible a recent Windows update might have enabled it for some people, since there seem to be several of us getting similar errors around the same time.
I am not offering advice on whether you should disable the feature, as it probably depends on what kind of security risk your network & files are, but here is information about how to configure the feature:
https://www.tenforums.com/tutorials...rs-controlled-folder-access-windows-10-a.html
The main thing is, the "Documents" folder is usually one of the folders which is protected by this feature by default (and in Windows Defender CANNOT be removed, unless the entire feature is turned off), and I'm betting many of you (like me) have your RMXP projects in there. So if you do not want to disable this security feature, I recommend moving your project to a different folder such as "C:/Users/<userprofile>/RMXP Projects" or something similar outside of Documents, so your other files can still be protected but Cartographer will be able to run successfully. For me, I just decided to disable it for Documents folder (I have AVG, which has an almost identical setting but allows disabling only the Documents folder) since it apparently prevents most programs from doing anything there, which is not really ideal for me. Hopefully this will help some people.