ID 393250 - Deadlock when adding a preset to favorites

Problem summary
Deadlock when adding a preset to favorites. This is possible related to the users custom python module.

Customer reported version
modo.12.2v1

Customer reported platform
windows10

Steps to reproduce
1) Open Modo.
2) Open the preset browser.
3) "Favorite" presets until a deadlock is encountered.

Expected behaviour
Modo should not encounter a "dead lock."

Actual behaviour
Modo encounters a "dead lock" and becomes unusable.

Workaround
Unknown.

Reproduced by support
Logged at developers request/per reproduction case in remote session.