I just deleted the datfiles again, re-downloaded them & the problem has gone away for now.

It's a wierd one, for sure!

It's got to be some sequence of events that STARTED it initially, and then did not fix itself until just now.

Rest assured though, it's not a problem with the way I have set the program up. The paths I have setup are not in error, I have checked them 15 times while looking at this issue.

Don't worry about it, it's just as a software developer myself, I hate having little problems like that in my programs. The harder to find, the more satisfying it is when you squash them! :)

It wasn't a huge issue, just thought I would let you know about it. Since I can't replicate it 100% of the time, there's nothing you can do.