is this the same issue as already posted called "Surfaces Disapears"
For both questions may I ask for Your exact Solid Edge version and suppose the more important issue:
Which graphics card are Your using (operating system, driver version)?
This could be a graphics problem as it looks like.
Her are some basic checks that come to mind:
1. Check if you have the latest MP for ST9 installed.
2. Is your graphics card driver updated.
3. Clear the %TEMP% folder and restart the computer.
4. Try changing setting in this area to Software driven:
I am able to reproduce the problem, it is more of a timed event as you have pointed out.
The model mysteriously disappears after about 10 seconds.
Initially I thought it was because of fiddling with one of the PMI dimensions but the surfaces disappears even without clicking the dimensions.
Sorry, no previous experience with this kind of problem or any known solution.
this seems have to do with a change in Your model tree.
If You look onto the skecth 18 and 19 in the tree, You will see the small grey arrow, indicating that here something went wrong.
There are lost connections to a prior geometry, I suppose.
Opening that sketch shows You small brown squares indicating the problem relation
Select them, delete it and do this in both sketches.
Afterwards those grey arrows disapear and Your geometry is visible again.
Take care to never, ever have those grey arrows in the tree.
They can be only a clue for a minor problem but alos can be the reason for big troubles
There is a similar problem with sketch 45, but this one is a minor problem which could be "solved" by Solid Edge itself.
But take care about, have a look onto it and repair it.
Finally You get a vaild part again.
great being able to help.
Regarding Your question concerning the reason for that problem.
Sorry, no I have no real good idea what hhappend with Your part.
I only can suppose that You have changed something before those sketches what changed/deleted the corresponding geometry.
And if Soldi Edge loose the geometry for a relation those arrows indicate that.
Try to remember what You have done and where You changed the part.