Yup - the silence in many threads is making me worried. My gut-feeling says that 4.1 will be make or break for Sencha.
The Sencha devs bit of quite a bit to chew on when producing 4.0 and now the silence and slipped schedule for 4.1 is worrisome.
(Or maybe I am just paranoid after reading the excellent book "Dreaming in Code" by Scott Rosenberg....)
Looks like this one fell through the cracks. I'll make sure this gets resolved. The problem is as follows:
The first time the child store gets loaded, the view has not been rendered yet. Once you show the list for the child combo, the view is now rendered. When we go back and select a value from the parent, it triggers a reload on the child store. The child is rendered, but not visible, so when it tries to align the mask it goes in the incorrect spot. I've added a fix that checks if the owning component is visible before showing the mask.
The fix should be part of the next release. Please confirm.
Twitter - @evantrimboli
Don't be afraid of the source code!