>> I tried to compile an .APK with an older Api
What API? AFAIK you now have to use at least API 26 or 27 . The latest versions of the Android SDK require those APIs, older API build tools are not supported by Google for building apps.
>> Sometimes MMF2.5 DEV becomes unresponsive after running an app.
>> Sometimes dragging to move a code no longer works after running an app.
>> Sometimes the copy feature stops working when trying to copy code after running an app.
Never noticed those issues.
>> Sometimes extensions continue to effect the PC, even after the application has been closed.
>> ( CONTROL X ) is one of the objects that refuses to release its hold on the PC within MMF2.5 DEV.
Could you post a MFA that shows those issues please?
>> It should be getting better and not worse.
There are no changes in Fusion that could explain this, perhaps the issues you mention are either in the previous versions too or happens only on your machine due to some software update.
PS: the official version is now 292.14 and it's not a beta anymore.