Hi Andrew,
I believe that the Receivables hot fix installs an updated version of the database interface file, which is common among all appliations. This file is named ADS32.DLL and can be found in the \softrak\system directory. When you restored program files for Receivables, did you restore this file as well? It may be that it was this file (or perhaps another common system file) rather than the Receivables program files that caused this issue, in conjunction with the state of your Payables data.
If you go to the \softrak\system directory and look for this file, what is the date and version (check the file Properties)?
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Regards,
Softrak Tech Support