V37 of SlideMagic had an issue on Windows: closing the last window with the top right ‘X’ did not completely close the app process and as a result, SlideMagic would not reopen again. This issue has been patched in V39 which should automatically install.
You can force an installation in 2 ways
Reboot your machine to close V37. Run SlideMagic V37, wait for 5 seconds until the ‘update available’ notification appears. Close SlideMagic V37 via the ‘Exit’ command in the file dropdown manu. Restart SlideMagic which should now start as V39.
Or download and install the latest version from slidemagic.com
This issue does not apply to Mac users.