I started having issues with synchronization after upgrading to paid Zotero storage. I use WebDav storage for my individual collections, but use Zotero for Group storage (the only option). Never had any problems. I had to upgrade storage for Group collections yesterday and Now it tells me I items have been modified in two places (local and remote location) and asks me to confirm which version to pick. For all items it asked me about the both version are identical. When I finished confirming items, it continued, then stopped and said " tags were added to some item on remote side". then it synchronizes items, but seems to never finish. Then I restart synchronizing and it seems to start from the beginning.