ID 439185 - Viewport stutter and popups automatically close after focusing Modo

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Problem summary
Viewport stutter and popups automatically close after focusing Modo. When Modo is alt-tabbed back into, or re-selected, the viewport may stutter and prevent the user from selecting popup windows.

Customer reported version
modo.13.2v1

Customer reported platform
10.14

Steps to reproduce
1) Open Modo.
2) Open another application.
3) Switch back to Modo.
Result: Modo may stutter and prevent access to popover forms.

Expected behaviour
Modo should not have performance issues when re-focused.

Actual behaviour
Modo can have various performance issues when re-focused.

Workaround
Unknown. 

Reproduced by support
Logged at Developer request.

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