Update:
Complete revision of the engine core components:

Object and Graphic Streaming:
Fixed graphics errors.

Delegate:
Unified.

Sound:
Unified. 

Performance:
Generally more stable and better.
High levels of opponents do not slow down the engine as much as in the previous versions.

Content:
Some maps are completely reworked.
Therefore, the current scope of this version is much smaller than
previous versions.

If the player wants to enter an area that is not yet available, a 
appropriate notice.

New:
Error messages in the game, are queried with in-game requester.
If an error occurs, the game can usually be at the last valid point 
(checkpoint).

Checkpoints are created at:
Entering / Leaving Maps
Collect Quest Items.
Various checkpoints on maps.

Known issues:
There may be break-ins in the frame rate:

This is done with:
Reaching a checkpoint (game progress is saved)
Loading larger files (animations)
Loading sound files (larger files such as background music are streamed, sound for interactive objects is completely loaded into memory)

Memory leak:
Causes frame rate drops 
Cause has not yet been determined.
Occurs rarely. Can be fixed by leaving the map and re-entering.
Is with one reason why some maps are being revised.