Several KSP commands that caused occasional crashes in 5.5.1 were rectified. For script-heavy libraries (e.g., orchestral legatos or rhythmic tools), this meant fewer unexpected exits.
The Kontakt Script Processor (KSP) in 5.5.2 is famously stable for custom instrument builders.
: Users who built their studios around the Kontakt 5 interface often prefer the v5.5.2 build to avoid the UI changes seen in version 5.6 and beyond.