[BTS] Backslash not working on Mac with Parallels and Win7

[jray]

Backslash key (\) is unresponsive in vanilla unmodded BTS 3.19, running on Win7 through Parallels Desktop 9 on a Macbook Pro. The backslash key works fine in other applications, and I can mod Civ4ControlInfos.xml to map CONTROL_LASTUNIT to the minus key KB_MINUS, which works. But the default KB_BACKSLASH doesn't work, nor does KB_EQUALS. Any ideas?