Suddenly broken .c3p file - preview not working - subscription not recognized [SOLVED]

Does anybody know what could be causing this?

Without changing anything on a .c3p file, it suddenly stopped previewing - in Debug it shows loading 100%, if I click on watch or the GPU profiler it tells me that these features are not in the free edition, even though I have an active and running subscription and I am logged in. Logging out and back in didn't fix it.

Even if I try to start a completely empty layout it does the same thing!

I feel very much lost with this.

Using C3 in Standalone mode, but it doesn't work with C3 in browser either. Previous versions of it work fine.

SOLUTION:

The problem was caused by a Function using the built-in functions, which was disabled but ther was an action calling it. This broke the file, even thought the function wasn't actually called, just by virtue of there being this action. enabling the function but disabling it getting called solved problem, as did deleting the function.

I found it by copying my project and deleting stuff from it until the bug stopped happening!

It says this:

action.js:1 Uncaught (in promise) TypeError: Cannot read property 'GetEventBlock' of null

at C3.Action._SetCallFunctionRunMethod (action.js:1)

at C3.Action._PostInit (action.js:1)

at C3.EventBlock._PostInit (eventBlock.js:1)

at C3.EventSheetManager._PostInit (eventSheetManager.js:1)

at C3.Runtime._LoadDataJson (runtime.js:1)

at C3.Runtime.Init (runtime.js:1)

at async e._InitDOM (domSide.js:1)

at async e._Init (domSide.js:1)