About the scramble puzzle blocks never stopping: I'm not sure! I've never come across that problem before. You could try refreshing the page?
About being unable to summon creatures, the fix for that is:
first buy the Vox-L artifact from our artifacts shop.
To get to the Artifacts shop, click the red square on the LearnToMod homepage. To buy this artifact, you'll need to complete one or two Quests ; get to Quests by clicking the wheel icon in the upper right corner; if for some reason you can't unlock a Quest, you can always press the Skip Quest button to proceed to the next one.
At the Artifacts shop, you can filter the results by clicking the purple filter tags in the corner to remove the default filters. The Vox-L game should be the first thing you can buy (super flat world) - click Download Vox-L Alpha and you'll be asked to sign in to the app. Make sure after downloading that enabled on your Artifacts page.
If this doesn't solve the problem, check your firewall settings.