Hi @lancipoos
MODX 3.0.1 brought some template changes which affected Articles.
See this: Display issue · Issue #160 · modxcms/Articles · GitHub
The next Articles release will fix that, but in the mean time you can apply the workaround mentioned in the link above.
Also, if you’re starting a new site, I’d definitely recommend using Collections over Articles. Articles is really quite old, and while we’ve been working to bring it up to date, the MODX 3 version is still in Alpha and there will probably be some weirdness that pops up from time to time. 