When browsing through very long folder structures (>23 folders in a hierarchical order) the Automic Web Interface 12.3.0.GA01-dev-feature-12.3.0-GA01-91040 will slow down and finally crash the complete tomcat instance.
Deletion of folders is therefore not possible.
Tomcat restart is required to restore AWI.
Using the legacy java client it is possible to browser the structure.
Release : 12.3
Component : AUTOMATION ENGINE
This is a known bug and the resolution for the same has been provided in the upcoming releases of AWI:
Automic Web interface: 12.3.2