Of course you can go back - if you still have the old stable version. It seems that the new stable version does not save the presets in the tws.xml file, as the older versions did, but somewhere else. That's why you lose your presets after logout.
Unfortunately IB does not provide links to the older versions of TWS even when the new ones have issues, which I find very stupid. Some years ago I had another issue with TWS and I went back and used an older version of TWS for about two years until I got a message saying that the version I was using would no longer be supported.
Does anybody know where to find older versions of IB TWS? After some search I found an older version available to download from Ninja Trader site, but it is a rather old version of TWS (960.2g).