I was having the same problem,
LabWindows/CVI may close unexpectedly when launching.
This issue occurs because of some bad logic when calculating the height of windows in the LabWindows/CVI environment. Most often, this is the result of closing LabWindows/CVI when it has a very small height.
after reading the known issue 239396...
I was able to apply the work around #1 and get going again. Thank you!