After updating TortoiseHg from v3.9.2 to v4.0, SourceTree now reports "Mercurial not found" when launched. The Mercurial executable file hg.exe still exists in C:\Program Files\TortoiseHg. The SourceTree dialog has a "Browse to the location of Mercurial" button, but it does not do anything (expected behavior: a file explorer window would open so I could point to hg.exe; observed behavior: no explorer window opens, and the SourceTree dialog simply reappears with the same message). Is anybody else seeing this? Does SourceTree perhaps not recognize Mercurial v4.0? (Windows 10 Pro, 64-bit, SourceTree 1.9.6.1).