Fields on parameter dialogues do not change colour online and do not show correct values (fixed from V1.5, V3.20)

Corrected from:
Cabinet Controller c520 V1.5
Cabinet Controller c550 V1.5
Cabinet Controller c750 V1.5

Cabinet Controller c300 V3.20
Cabinet Controller 3200C V3.20
Panel Controller p300 V3.20
Panel Controller p500 V3.20

Response of the new version:
All tabs with parameter dialogues in the PLC Designer show the correct online value or status.

What happens?
Fields on parameter dialogues of EtherCAT slaves do not show the current values online or these fields do not change to yellow or red after logging in, but remain white or grey as in the offline case.

When does the behaviour occur?
The behaviour described above can occur if the parameter dialogue (the tab card) of the EtherCAT slave is open when downloading a PLC Designer project.

Which products are affected?
Cabinet Controller c520
Cabinet Controller c550
Cabinet Controller c750

Cabinet Controller c300
Cabinet Controller 3200
Panel Controller p300
Panel Controller p500

Short-term measures:
Execute the menu command 'Clean all' (menu 'Build') and log in again (menu command 'Online' > 'Log in'). 
Close the tabs with parameter dialogue boxes before downloading the project.

Evaluation/Recommendations:
This function restriction occurs very rarely. If it occurs, the parameters of the EtherCAT slave can neither be observed nor changed in the affected parameter dialogue boxes (tab cards of the PLC Designer).

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