Loss of blend
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This is a recurring issue

Changing the blending options causes blended objects to disappear completely (this is not a refresh problem). The only solution is to close the file and lose the latest editing if the file had not been saved. I have this problem very often and it's becoming a bit frustrating.
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@Pat I will open a bug on this, and will try to replicate it.
One thing that might help, send me a file that was saved just before the loss of blend (correct version) and then an other version saved just after the loss.
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@VectorStyler I will try to replicate this issue asap & I will send you both files.
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@VectorStyler Got it
 it's when I go back in history (History panel) and select a former state, the blend disappears.
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@VectorStyler Files sent

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@Pat Got it, will try to fix it ASAP.