I am using SheepShaver on Windows 10. I had everything working, so I went to download Stuffit Expander 2011 to extract some software to use with SheepShaver. When the installation process was done I had to restart my computer. After the restart, I attempted to open SheepShaver, which did not work. There was no error message. It just did not start.
If you're not getting anything back, start it from the command line as JDV suggested in a comment. Try the regular
SheepShaver.exe file first, not the
SheepShaverGUI.exe one if that exists.
If you don't see anything come up, there are two files you can look for in the SheepShaver directory:
stderr.txt. These are the "console output" files from the SheepShaver process and take a look. Normally, the
stderr.txt file will be removed automatically if empty, so it might not appear after the program shuts down. However, the
stdout.txt should remain and have at least some diagnostic messages if anything. From one of these files it should indicate what failed (missing DLL? missing ROM? etc.). If you're having trouble, update your question with the output of (or a link to) these files.