I see some strange things happening witht features in parts. All of the sudden the are deleted on their own. Am I the only one because I read nothing about this problem.
You are probably the only one. What do you mean they are deleted? Are the features just not visible in the graphics window but are still listed in the Pathfinder tree, or are they gone from both?
That is what I thought.
There is nothing visible anymore, not even with show design body. At first I saw in the Variable table some variables but the second time everything was just gone. I know that I have saved it but all of the sudden it just disappeared and was deleted.
Can you post a screenshot of the entire Solid Edge application window showing the issue?
Possibly similar to this issue noted by a few of us in ST6 (I think)? http://community.plm.automation.siemens.com/t5/Solid-Edge-Misc/Previously-saved-files-reverting-back...
I never heard if the cause of this behaviour was ever identified. I haven't had this happen lately.