Disappearing Assemblies

I was wondering if anyone else is have a problem with assemblies
disappearing in QUOTE ENTRY. For instance, we have a line item with
multiple assemblies. After entering operations for one of the
assemblies we did a resequence of operations. After that everything
disappeared from view except for that one assembly. We have tried
everything to get all other assemblies to show but the only way to do
it was to close quote entry and reopen it. I went into near panic the
first time this occured, thinking I had lost all that work. Thankfully
everything was fine when quote entry was reopened. If anyone else has
encountered this how did you handle it? Is this the way it is supposed
to behave and we just haven't found the proper way to get everything
else to display again or is this a bug?