Thanks for the report. I'll take a look.
I can't replicate this -- is there anything else you can think of that you did to get yourself into this state?
I can consistently repeat it. It appears to depend upon (a) having it in page mode when first opened and (b) when one expands the window over the 1/2 window it automatically opens in, the scroll bar appears ... but scrolling down with mouse does not make the scroll bar show.
Use panel menu to set columns to zero
Looks like the culprit was just needing to switch this to a NEW item in the columns list. Mine was already set to `none`. I'll create a case, thanks