Here are the issues that persist as of today even after the release of Studio 3.18094. This is it making difficult to further develop using PowerApps. When classic rendering is enabled, I am unable to select any options from the combo box list. If someone could look into the combo box issue, it would be much appreciated.
When improved app rendering is enabled, I experience the following issues in the iOS player:
1) Delayed screen transitions. 2) Formulas activated in the OnVisible are delayed. 3) Items in a gallery list do not scroll smoothly. 4) Autoheight on labels does not work. Text is cut-off on screen.
I am using iOS 12.0.1 and PowerApps iOS 3.181022.22. However, these issue have been relevant trhough all versions. I deactivated delayed load and re-installed PowerApps on my iPhone. The issues still persist. 1) The text inside of labels which are set to auto-height are being cutt-off. 2) Variables placed in the OnVisible action are delayed. I have an a couple elements that depend on a variable's status to set their visibility to true or false. When using the improved app rendering, the DOM elements are visible before the OnVisible executes and therefore the elements show for a brief second before the visibility is set to false from the OnVisible action.