I noticed again a file in folder C:\Users\%username%\AppData\Local\AxCrypt\%tmpname%, that I have used and saved one month ago. In the meantime I have used the file again and saved more times. Now I can delete the file in appdata (data loss) or compare both files and merge.
Creating backup jobs or scripts for checking the local folder is not a way for us. To ensure no dataloss and secure files is a job of the software.
I tested it as a global solution for our company. Sorry, but this is no way.
I will decrypt and use something else.