I have just installed the new update for SDL Trados Studio 2017 SR1 and immediately after opening the program I found that numerous things no longer work.

Simple things like Ctrl+A, Ctrl+Z, Ctrl+Y, or even Ctrl+T (this one especially important when working with projects with fuzzy matches) in the Editor do not work at all. Each time I press any of those combinations (possibly more) my studio stops responding for a couple seconds to 2 minutes (I counted) and I cannot use those standard keyboard shortcuts.

I cannot also revert back to the previous version of Studio as my installer says it cannot be done.

I have numerous important projects to work on, and I basically cannot do it efficiently, with having to click everything with the mouse instead of using shortcuts.

Additionally, after trying to use those combinations for several minutes, my Studio started blurting out error notifications making it impossible to close an ongoing project or even exit the application without closing it from the program manager.

What gives?

Was this update even tested before rolling out?

Because it seems to me this is the second update to SDL's popular applications in recent weeks, which has built-in flaws that are visible at a glance.

Help? How can I revert to my previous Studio version without losing the lists of all my (several thousand) ongoing and completed projects?

EDIT:

OK, I uninstalled Studio 2017 SR1, installed the previous version (fortunately I have an installer backed up) and everything works fine now.
BTW. Ctrl+< and Ctrl+> also did not work for SR1, which makes it completely impossible to work with any projects, which contain any tags. If I were SDL I would really consider withdrawing this SR1 version and publishing it at a later date only, when the issue I report is resolved. That it occurs on other computers I know, because I already managed to install it on several of our linguists' computers and everyone had the exact same issue.

I use Professional, my linguists use Freelancer and the problem occurred for all of us.