After opening an existing TWS solution created with a previous version of TWS, the FIND IN FILES dialog was not opening when using the menu (EDIT | FIND AND REPLACE | FIND IN FILES), or when using the shortcuts
WORKAROUND: I closed TWS, and restarted TWS. Before opening my existing project I opened the FIND IN FILES window from the menu, and the dialog appeared. Then I opened my solution with the FIF window still open, and the FIF stayed visible. Opening and closing it after doing these steps worked correctly from then on.
I just updated to the new version of Welkin Suite today (v0.29.19.4), overlaying the previous latest version with this new version. I am running on Windows 10. I have VS2015 Profession Edition installed if that might have any effect.