Access issue after installing TortoiseGit

[John Emmas (johne53)]

I just downloaded 64-bit TortoiseGit 2.18.0.1 (for Windows) after previously using a much older version. Some of my pre-existing repos work fine but two of them give me the attached message when I try to use Show Log :-

It seems to be suggesting that these particular repo paths aren't owned by me. But they worked fine with my previous TortoiseGit. Any suggestions for how I can fix this?

[John Emmas (johne53)]

I should add a couple things which might be worth considering:-

1. I did try that git config command but it didn't help
2. All my git repo's are on a FAT32 drive - and AFAIK, FAT32 doesn't have the concept of ownership