Cubase 6.5 retrologue problem

Hi all i started a project this week using 2 pad shops and 2 retrologues but when i open the project again the first retrologue has no sound .only way to fix this is to reload a new retrologue and assign the midi to it but even if i save the new project and reopen the new project the first retrologue has no sound again ?

regards
telogic