When you use all users installer – Tabular add some entries to the HKLM – local machine hive of the registry – one of this entries is load behavior of the add-in which by default is load at start up. Unfortunately sometimes on a crash the Add-in gets unloaded — it actually adds this unloaded change to HKCU – current user hive of the registry. So then a conflict happens and you can not load the add-in anymore as you change the value in HKLM but the HKCU always stays unloaded and it has the higher priority.
Unfortunately this needs a change in the windows registry. At the bottom of the article there is a link to a reg file – download it, unzip it and then run the file. This reg file will change the HKCU entry to load on start as well. Note that in some client environment changing registry is disabled by IT so you might need to ask them to do the change. Contact support if you need more info.
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