Save Failed in OpenXcom Most Recent Nightly

[doctordetroit8]

In the most recent nightlies, every time I try to save "1234", I get this pop-up error:


Save Failed

Failed to save 1234.sav.bak

It seems to be the same error as this, but I cannot find the solution:

https://openxcom.org/bugs/openxcom/issues/1265


I can still use a nightly from a couple years ago, but the most recent ones have the same issue.

Thanks,