Every update seems to fix something and break something else!
This is one of the reasons game development (and software development) is hard. No matter how hard you try to avoid it, every bug fix has a risk of making a new bug. This is why you need frequent builds at this stage. What you should do is report all the bugs you find, this is the way to help FD. Even if they are not spending time acknowledging bug reports they are very likely reading them as they come in to see common patterns.
It's not as simple as "go and fix bug 236478 now!". Many bugs are usually down to a single cause, so you have to be smart in processing the information.
Trust in FD, they know what they are doing, and frequent builds are how we know progress is being made.
And you can bet not all fixes are integrated into builds yet: they have to manage the flow of work. Look here is a picture I made from a talk of mine, which should help you understand what goes on...
Orange boxes are inventory, green are processes that process the inventory. in the Gamma test, we are in the QA (Product) box. We do not see everything that is going on and you can bet a lot is going on, and we do not immediately see the latest work of the devs, because they have to test that internally and integrate the work into builds.