Recently, we found an issue where the salesperson was able to print the proposal, then go back to the edit proposal and make a change.  
Sometimes this change would create two different proposals.  One that could be a different price or product offering than what was originally intended.  

For a short term fix we implemented this "reload page" function to force the user to reload the page before printing again.  There is a button like this on your browser that will reset the page.  It looks like one of the pictures below:  

Please continue this practice until we find out a better solution.  
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