lead up the garden path by solidworks

Why does solidworks 'work' one moment and fall to pieces the next, with the
same files and everything? I've been working on imported surfaces, which
came in a knitted together fine (two halves of a bottle). Then I thicken to
solid and perform a whole range of other tasks on them, then save and close.
Then I reopen with no problem, edit and add features with no problem. Then
I save and close, re-open and re-edit, and BAMM - original surface-knit no
longer works. So why lead me on like this? I know I can use CTRL-Q to check,
but why build the surface-knit in the first place?

(SW2003, SP3.1, Win2K, 1GB RAM etc etc...)

 

We've got one part that cycles through good and bad every time you rebuild
it. Other parts seem to fail much more randomly. We have parts that are fine
for long periods of time and then suddenly fail. Rebuilding them brings them
back OK...for a while. Sometimes one part, which is based on another part,
will suddenly fail. Load the base part, which is invariably OK, and then the
child will rebuild successfully. I don't have any explanation for any of
this, but adding more new features is apparently much more important than
making the modeler more robust.

Jerry Steiger
Tripod Data Systems