Bug: Cant see componenents after reopening file

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Hi David,
I made a Grasshopper file that is producing a lot of lines, and I
stream the line lenghst via post it to a .csv file for Excel exchange.
The csv file is on my desktop. When I reopen the grasshopper file the
grasshopper component area is all red and the components are not
visible. When I zoom they show up for ab second. All the components
are working and producing objects in rhino, they are just not visible
in the grasshopper window.
Help please, thx Oliver