First, let’s try to make sure that you don’t lose your work. If you aren’t able to save your show file, try exporting your show data by going to File > Export > Export all show data tables as combined csv… This isn’t the same as saving your show but it will make it possible to recover your positions, script events, and per-show effects which could be much easier than starting over.
As for solving the real problem, is the hard drive in your computer almost full? Each time a show is saved, a backup copy of the show is saved to the backup files directory on your local hard drive. Consequently, low hard drive space can cause a saving errors even if the primary location you’ve selected to save your show is an external hard drive or USB flash drive.
