Bug in the Element groups

[Ralazem]

I have noted a bug regarding element grouping. I have grouped walls together, and then when i go to performance criteria and click on select walls, it says there are no elements. Then I go back to the original group to check, and indeed, all of the elements i have grouped together disapear.

[z.gronti]

Dear Ralazem,

Could you please check if you use the latest version of SeismoStruct v2018-Release 3?
I tried to create the reported error but in my model the wall's group works fine. If you do use the latest version and you still get the reported error, could you please send me your model at z.gronti@seismosoft.com to check it?