Hi @RWSD, these symptoms sound particular to the file you're working on and seemingly not due to the quantity of geometry in it. You could try to search for this yourself or submit it to Tech Support for review/diagnosis and hopefully a fix. My experience suggests it could be one or more corrupt objects.    To get this looked at ASAP please submit this issue through Tech Support channels:  If you're in the USA: https://www.vectorworks.net/support/help If you're elsewhere: Con
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