Thanks for reporting. Reproduced and added as: https://www.ventismedia.com/mantis/view.php?id=20322

I can confirm this - appears to be new bug.

This is when using "manage views, edit" in my case I chose list and click on the pencil (edit icon), added one column, and no more could be added until i click OK and click on the pencil again.

By the way, does still nobody think that making the selected default sort order stick as set in a custom view is a good idea??

I think there is a new bug in the 'Choose Columns/Sort' feature of the main panel list view. Using the latest build 5.1.0.2821 of MMW5 which I just installed.

When trying to add additional columns, I can only select and add one new column, can't add more until I select 'OK', exit the edit session and restart. I can then add one more column before having to 'OK' and restart again. A couple of releases ago, I could add multiple new columns in one editing session. Pretty simple, so not sure what I could be doing wrong here?