This is still being investigated. We believe the problem is happening with the newest version of the Excel integration system file SSI2XL.DLL that was installed by this Payables upgrade, but we don't know whether it is not interacting properly in your workstation environment, or if something failed to install for you correctly as part of the Payables upgrade, or if there is a more general problem.
I have only heard of this error at one other site, and in their case their workstation on their terminal server was very low on available free memory.
You probably will want to get your Adagio consultant involved. Checking the error logs in the \Softrak\Ledger folder (or whichever applications you saw errors in) will be something you can do with them.
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Regards,
Softrak Tech Support