"Issues per assignee" reports stopped working

I registered an InCloud YouTrack account a few days ago and everything worked fine. However, since yesterday, one of the reports (both "Issues by assignee" with different parameters) stopped working saying "Something went wrong". I tried refreshing but it didn't work. All new reports of type "Issues by assignee" aren't working as well.

This is a short video of me creating a default report and it doesn't work:
https://youtu.be/H4QdpwFn84o (not very informative, however)

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