Hi Welcome to the Forum scheishaus!
Here are all important links:
http://lmms.io/forum/viewtopic.php?f=1&t=4740
-A few rules and useful forum instructions -amo, how to post images :)
When you say 'gone' are those names you have made, or are they default names?
* is the issue in all projects?
I also need to know:
* OS (+service-pack-version)
* lmms version
* hardware specification (ram & soundcard is the most important)
* lmms instrument involved
* lmms preset (if a factory preset is used)
* a screenshots of error-state