SoapUI not saving assertions made for scurity tests

Hi, Im using a SoapUI 5.0 Pro trial version. Im creating security tests for my project. They run fine but when I save the project with assertions made for each security test, then exit the software, run it once again and the assertions are gone. I have to make them again.
Is this due to the trial version ?

Edit : I also tried that with free version of SoapUI 5.0 some of the assertions disappear but some stay. It is very strange.