The two problems are independent.
Concerning the NexeedIpAtmoVision peripheral object: Thanks for reporting this bug! The object definition always had a flaw that becomes relevant in CpStudio 5.8. Older versions had a misbehavior that neutralized the bug. The bug will be fixed in a new object version 1.0.13.0 that comes with the next monthly object release.
About the SimulationAddon: CpStudio 5.8 fixed the bug that the SimulationAddon was removed and re-created every time when switching simulation mode off and on. When converting a project containing the SimulationAddon to 5.8 while simulation mode is switched off, the next object reload will create the SimulationAddon that was missing before. As it is technically not an Addon while simulation mode is off, it is created outside the Addons folder. But if you move the type definition to the Addons folder in CpStudio, it will stay there, so the export error does not occur anymore.
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