Mails sent blank in version 8.5.3 (mac)


I've had this issue for a while and have not been able to resolve it:

On my mac laptop, I run Maxbulkmailer 8.4.9, and can send mails fine. Tracking works through MLM.

On my desktop, I run Maxbulkmaier 8.5.3. All mails sent (using the same MLM info as above) are sent empty (without content)

Is there any solution to this ? I have encountered this issue since version 8.5.1, and hoped 8.5.3 would fix it. I currently stick to sending my mails with 8.4.9 on the laptop, but would like to know if this issue could be solved