not working

Installed plugin, setup is easy and no errors possible.
Left it as it was, using a hashtag.
Embedded the carousel code: it worked for a few seconds.

Until I changed it to another one of the offered options: pictures not showing on page anymore (looks like plugin isnt there).
Tried so many different options, deleting code, putting code in again, using grid instead, changing from 1 line to 2 lines, from hashtag to full account, no result.
Nothing shows on page.
No idea why it worked in the beginning but with the first change disappeared.
Also cleared cache several times during the 30 min trial.