Crash "Out Of Memory" en rewire

Why do 'Out of Memory' crashes occur?

Live doesn't know how much of the memory reserved for its operation is already filled. With the scenarios described above - having RAM mode enabled for too many audio clips and/or working with large sample libraries, it's very easy to reach the limits.
Now, performing any action in Live that needs more memory than currently available might result in a crash. These actions could be:
Editing operations on clips and tracks (e.g. Copy, Cut, Duplicate)
Adding more samples
Adding devices or presets
Live Set RAM optimizations and workarounds

Flattening tracks that contain said memory consuming devices frees up memory.
First, freeze the tracks.
The Flatten command then replaces any original clips with the audio files created by the freezing and then removes the devices and the samples from the Set.
If a Set containing memory consuming devices already crashes on loading, it can be restored like this:
Open an empty Live Set.
Locate the problematic Live Set (*.als file) in Live's browser.
Unfold it by clicking the little arrow on *als file - all the tracks contained in this Set are shown now.
Import one track of the Set via double click or drag'n'drop into the empty Live Set.
Now, freeze and then flatten the imported track.
Proceed with the next and following tracks.
If a Set containing many (large) audio clips with enabled RAM mode crashes on loading, it can be restored like this:
Open an empty Live and unfold the problematic Live Set in Live's browser as described above.
Import a track containing clips via double click or drag'n'drop into the empty Live Set.
For all audio clips, turn the RAM switch in their Sample display off.
Proceed with the next and following track.
Save the new Set.