zotero stopped working

When starting firefox, zotero's not working at all. It says in Dutch: "er is een fout opgetreden bij het starten van Zotero" this means: an error has occured while starting Zotero. I tried re-installing both Zotero and Firefox (both latest versions - no beta) but isn't helping. Need to get a lot of work done today, so this is quite inconvenient...
Hope you can help.

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Never mind - it went back to work

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