It's probably CORS (i.e. cross-domain requests). Also some platforms now block insecure HTTP completely - you really should be using secure HTTPS for everything these days. Mobile apps may also need extra configuration to whitelist which domains it's allowed to communicate with.
It looks like a bug, please file it to the issue tracker.
Given C2's code itself has changed so little over the past several releases, I'm working on the theory that stability issues may be caused by third-party libraries the editor uses. I just released r270 which updates two internal libraries to the latest version. Let me know if that makes any difference.
Please file a bug report following all the guidelines. We need all the required information to be able to help.
Fixed for next release
Just cut the group in the first sheet and paste it in to the second sheet. All the function references disappear when you cut, but they come back when you paste. I just tried it and it works OK.
It's probably just garbage collection, and the GC not running yet because the system isn't under memory pressure. Anyway that appears unrelated to the original post and should be filed as a bug report following all the guidelines if it is to be investigated.
Construct maps Alt + Shift + Left/right to the next/back keyboard shortcuts, which prevents them performing their default action. However it's easy to make sure these shortcuts don't have effect while typing, so I made that change for the next release.
The "Save" button appears above the "Save as" menu, which is not in your screenshot.
Please only post in English on this forum.
Note Construct 2 does not support being translated. Construct 3 fully supports translation and several languages, including Portuguese (BR), are already available.
If that's the case how much of a performance hit does a situation like this result in.
Answer your own performance questions with measurements
Also if you can't see it using up time in the profiler, it's not important and trying to optimise it is a waste of time.
It looks like it's working fine here. Make sure you haven't blocked Construct from saving cookies or storage.
You're using unsupported SDK features so we will not offer support. See the warning in the manual:
AdMob is a complex advertising feature and I guess it needs a 1mb library to work.
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Note this is documented in the manual as part of the Set Z elevation action:
Z elevation only affects the appearance of the object. It does not affect collisions - everything else continues to work in 2D as if its Z elevation was still 0.