Problems with Responsive HTML layout in version 2017

Hi, I am testing version 2017 prior to a planned upgrade from version 11, and have discovered the following problems. It would be really helpful if anyone could suggest a fix for these problems. Failing that, it would be encouraging to know that Adobe were planning to implement a fix. I am using the trial version of RoboHelp 2017 which I downloaded a fortnight ago.

Problem 1: you cannot drag the divider between the TOC and a topic unless you do it very slowly (problem occurs in Firefox, Edge and IE11).

Problem 2: if you move away from the search results after searching for an item, by clicking on the TOC, and then search for the same item again, the search is not executed the second time. If you search for a different item, the search works fine. (problem occurs with all browsers).

Problem 3: after searching for an item, if you minimise the search results by clicking the "double arrow" button on the divider between the search results window and the topic, the search results are minimised, but the box for the search item remains displayed above the search results window. (problem occurs with all browsers).

Any advice would be appreciated, thanks.