I didn't use any odd Theme. In fact, I just don't touch them after system intallation. In system settings, there are 3 themes in default: Cinnamon, Linux Mint, and Mint-X. I have tried them all and found the same problem as I described. What you described is right in some way: "When I right click to rename the file is listed white on green". BUT, when you started to type in the new filename, the filename color tuned too dark to distinguish from the background.