aSub-Tabs Disappering

Hi,

I have a problem with the sub-tabs which diseppears after going to another tab.

So (I will refer to attached pictures):

- if I open the Operator Workplace and go Aux tab then I can see all subtabs

- if I switch to another tab and then come back to Aux then all the subtabs under Aux are gone and I cannot get them until I restart the Operator Workplace.

- Is it happening just with Aux tab. If I switch in between the others tabs I get all the subtabs, and I dont have it all the time. For some days the subtabs diseppears and for some days I have them.

I cannot relate the problem with some display/grafical settings because nothing changes.

Dose anyone has any clue what can trigger the problem?

Thank you!